Learn English – Uniqueness vs. Unicity

differencesmeaningsynonymsword-choice

Uniqueness and unicity can be synonyms when they are used to describe something that is “unique”, meaning something that is distinct from all other things.

Are these terms interchangeable, or do they carry slightly different meanings?

Best Answer

Mathematicians' answer

Mathematicians (whose native language is not English) may use unicity, modeled after the French unicité, in place of the preferable word uniqueness.

In a similar way, foreign mathematicians also use compacity in place of compactness. Even if the mathematician is a native speaker of English, if his teacher was foreign, he may still have picked up compacity and unicity.

Another one is analiticity. But there is no (common) English word analiticness, so in this case I guess there is no avoiding analiticity.