INDIVIDUALITY

identity, personal identity, individuality

(noun) the distinct personality of an individual regarded as a persisting entity; “you can lose your identity when you join the army”

individuality, individualism, individuation

(noun) the quality of being individual; “so absorbed by the movement that she lost all sense of individuality”

Source: WordNet® 3.1

Etymology

Noun

individuality (countable and uncountable, plural individualities)

(uncountable) The characteristics that contribute to the differentiation or distinction of someone or something from a group of otherwise comparable identity.

(countable) A person.

Source: Wiktionary

In`di*vid`u*al"i*ty, n.; pl. Individualities. Etym: [Cf. F. individualité.]

1. The quality or state of being individual or constituting an individual; separate or distinct existence; oneness; unity. Arbuthnot. They possess separate individualities. H. Spencer.

2. The character or property appropriate or peculiar to an individual; that quality which distinguishes one person or thing from another; the sum of characteristic traits; distinctive character; as, he is a person of marked individuality.

Source: Webster’s Unabridged Dictionary 1913 Edition