Philosophy. In Aristotelian thought: relating to or denoting properties which are not essential to something's nature (see accident, n. 1a)…

Non-essential; = accidental, adj. 2. Obsolete.

Having the nature of a logical accident; not affecting the essence, non-essential. Cf. accidental, adj. 1 2.

metaphorical Non-essential.

Of contingent nature, non-essential; as n. a non-essential.

Not essential.