Fragrance terms: a glossary, and the fact that eau de parfum has no legal definition

Fragrance labels can feel like specifications dressed up as vibes. Some describe labelling rules or industry convention; others describe an experience your nose can judge.

Eau de parfum is the sharpest example. FDA's page on fragrances in cosmetics does not define “eau de parfum,” “eau de toilette” or “cologne,” or set concentration thresholds. We are not aware of a US regulation that does. Ranges repeated online are industry convention, not traceable to regulation.

The short version

Bottle language is less precise than shoppers assume; ingredient labelling has a legal framework.

• EDP, EDT and cologne: industry conventions, not US legal concentration categories.
• Notes, sillage and projection: language for how a scent is built or perceived, not laboratory measurements.
• The fragrance pyramid: a marketing and teaching device, not a chemical structure.
• “Fragrance” on an ingredient line: a regulated convention that can hide a complex formula behind one word.
• “Unscented” and “fragrance-free”: not interchangeable; FDA's page does not define “fragrance-free.”

Table of contents

• The words on the bottle
• How a fragrance is built
• How it behaves on you
• The families
• Labelling and safety words
• Which of these words should change what you buy?
• The bottom line
• Sources

Key numbers

• 0 verified US thresholds: FDA's page sets no concentration threshold for EDP, EDT or cologne. Source
• 3 undefined bottle terms: “eau de parfum,” “eau de toilette” and “cologne” are not defined on that FDA page. Source
• 1 shorthand ingredient word: a formula may appear as “Fragrance” or “Flavor.” Source
• 1 labelling reference: cosmetic ingredient labelling is addressed by 21 CFR 701.3. Source

The words on the bottle

Every concentration term here is INDUSTRY CONVENTION. These labels may correlate with different formulas or experiences, but are not US legal definitions with fixed thresholds.

• Parfum / extrait — INDUSTRY CONVENTION. Usually signals a more concentrated presentation, without a legally fixed threshold or wear guarantee.
• Eau de parfum — INDUSTRY CONVENTION. A widely used category name; FDA's page does not define it, so treat it as a buying clue.
• Eau de toilette — INDUSTRY CONVENTION. Commonly signals a lighter format, but cannot tell you exactly how long formula will last.
• Eau de cologne — INDUSTRY CONVENTION. May mean a lighter format or men's fragrance generally, so it is poor evidence of precise formula.
• Eau fraîche — INDUSTRY CONVENTION. Suggests a fresh, light presentation; sample rather than buying the promise.
• “Concentration” — INDUSTRY CONVENTION. Usually means the amount of aromatic material, but a bottle claim is not automatically a regulated threshold.
• “Juice” — INDUSTRY CONVENTION. Forum and retail slang for the liquid; it says nothing about quality, ingredients, or performance.
• Flanker — INDUSTRY CONVENTION. A related release using an existing name or idea; it identifies a product family, not suitability.
• Reformulation — INDUSTRY CONVENTION. A changed formula; it does not say whether your nose will notice.
• Batch code — INDUSTRY CONVENTION. The code stamped on the bottle that identifies a production run. Enthusiasts use it to guess a bottling date and argue about reformulations; the FDA page we relied on does not define or require it, so treat the decoder sites as hobbyist reference, not documentation.
• Decant — INDUSTRY CONVENTION. A smaller transferred portion useful for testing on skin before buying a full bottle.

How a fragrance is built

These terms describe materials, stages, or teaching metaphors.

• Note — PERCEPTUAL. A smell impression associated with a material or idea, not proof that one isolated ingredient is present.
• Top, heart and base notes — INDUSTRY CONVENTION. Time-based shorthand for opening through drydown, not three compartments in the bottle.
• Accord — INDUSTRY CONVENTION. A blend creating a combined impression, not necessarily a single ingredient.
• Fragrance pyramid — INDUSTRY CONVENTION. Notes organized into top, heart and base for marketing and teaching; not chemical structure.
• Aroma chemical vs natural extract — INDUSTRY CONVENTION. A manufactured scent material versus one from a natural source; neither predicts whether you will like the composition.
• Absolute — INDUSTRY CONVENTION. A fragrant extract; the term describes material format, not naturalness, quality, or wear.
• Fixative — INDUSTRY CONVENTION. A broad term for material said to affect cohesion or evaporation, not a guarantee of lasting power.
• Musk — INDUSTRY CONVENTION. A scent family or material style creating softness, warmth, or skin-like effects; the finished smell matters more.
• Aldehyde — INDUSTRY CONVENTION. A class of aroma materials used for distinctive effects, not one smell or a freshness guarantee.

How it behaves on you

Performance vocabulary is mostly PERCEPTUAL. The same fragrance smells different on different people, so exact results require actual wear.

• Sillage — PERCEPTUAL. The scent trail around you as you move, not just what you smell at your wrist.
• Projection — PERCEPTUAL. How far a scent seems to radiate from skin; it is subjective, and louder is not automatically better.
• Longevity — PERCEPTUAL. How long you perceive fragrance on skin or clothing; formula, skin, environment, and observer matter.
• Skin chemistry — PERCEPTUAL. Shorthand for why one fragrance smells different on different people; nobody can predict it for you.
• Nose blindness / olfactory fatigue — PERCEPTUAL. Reduced awareness of a familiar smell, so the wearer may stop noticing what others can.
• Scrubber — PERCEPTUAL. Slang for a fragrance someone wants to remove because of a personal reaction.
• Beast mode — PERCEPTUAL. Forum slang for unusually strong projection or persistence; not a measurement and often a cue to apply less.

The families

Fragrance families are organizing language, not legal categories. They narrow a search but cannot replace smelling it.

• Fougère — INDUSTRY CONVENTION. A classic clean, herbal, aromatic family; a style reference, not a fixed ingredient list.
• Chypre — INDUSTRY CONVENTION. A dry, structured, contrast-rich family; a historical style label, not a formula.
• Oriental / amber — INDUSTRY CONVENTION. Warm, rich, resinous, or spicy impressions; neither word guarantees a particular material.
• Aquatic — INDUSTRY CONVENTION. A watery, airy, or marine effect, not literal water or a universal note.
• Gourmand — INDUSTRY CONVENTION. Edible impressions such as sweetness, dessert, or roasted warmth; not a nutrition label.
• Woody — INDUSTRY CONVENTION. Dry, smooth, earthy, or forest-like impressions, ranging from crisp to creamy.
• Fresh spicy — INDUSTRY CONVENTION. Bright, clean feeling with peppery or aromatic energy; not a promise of lightness.
• Citrus aromatic — INDUSTRY CONVENTION. Bright citrus with herbal or aromatic facets; the balance depends on the composition.
• Leather — INDUSTRY CONVENTION. A worn, smoky, dry, or supple impression; not an ingredient requirement.
• Green — INDUSTRY CONVENTION. Leaf, stem, herb, or freshly cut vegetation impressions that may feel crisp, bitter, soft, or earthy.

Labelling and safety words

Some words concern labelling; others describe experience or safety context. Read the legal wording narrowly.

• “Fragrance” as an ingredient line — REGULATED. FDA says, “fragrance and flavor ingredients can be listed simply as 'Fragrance' or 'Flavor.'” Complex formulas may be trade secrets; the reference is 21 CFR 701.3.
• “Unscented” vs “fragrance-free” — REGULATED / UNDEFINED ON THE FDA PAGE. FDA says, “Even some products labeled 'unscented' may contain fragrance ingredients,” while its page does not define “fragrance-free.” Do not treat them as synonyms.
• IFRA — INDUSTRY SELF-REGULATION. IFRA is the fragrance industry's standards body; its standards do not make EDP, EDT, or cologne US legal concentration categories.
• Allergen — PERCEPTUAL / CONTEXTUAL. A substance that can trigger an allergic response in a susceptible person; read product information without assuming every scent affects everyone alike.
• Cosmetic vs drug — REGULATED. FDA says a product intended to make a person more attractive is a cosmetic under the law. That concerns intended use, not medical treatment.

Which of these words should change what you buy?

Buy based on how the scent smells on you, whether the label tells you enough, and whether you can test it. EDP versus EDT is a sampling prompt, not proof that one will outperform another.

Scent is part of a first impression that works at conversational distance but cannot be photographed. The wearer is most likely to stop smelling it. Start with how to apply cologne properly, then use how to find a signature scent to choose something you can live with. A fragrance is a small, cheap, reversible lever, not a fix for anything — and it sits alongside the unglamorous baseline covered in deodorant versus antiperspirant, which does more work than any bottle.

If you want the visual half separately, /test is free and shows how a photo reads rather than scoring you. For wearing scent through a day, compare how to make cologne last longer and how to smell good all day.

The bottom line

Eau de parfum, eau de toilette, and cologne are useful shopping language, but FDA's page does not define them or set their concentration thresholds. Cosmetic labelling can use “Fragrance” for a complex formula, while “unscented” does not necessarily mean free of fragrance ingredients.

Buy a scent you like on your skin, use performance words as descriptions rather than promises, and sample before treating a label as evidence. This material is for orientation, not appearance anxiety. To separate photo perception from what no camera captures, try the free /test.

Sources

• FDA. “Fragrances in Cosmetics.” https://www.fda.gov/cosmetics/cosmetic-ingredients/fragrances-cosmetics
• Electronic Code of Federal Regulations. “21 CFR 701.3: Designation of ingredients.” https://www.ecfr.gov/current/title-21/chapter-I/subchapter-G/part-701/subpart-A/section-701.3
• International Fragrance Association. Official site. https://www.ifrafragrance.org/