- Odor Fragrant molecule suspended in the air and perceived by the olfactive system.
- Olfactive balance Combination of fragrant components in which none are predominant.
- Olfactive Pyramid Structure that gives the description of a fragrance according to its top, middle and base notes.
- Olfactive Memory The brain's capacity to retain the memory of previously perceived odors.
- Oxidation Chemical reaction of a fragrance in contact with oxygen in the air.