Something non-essential, subsidiary, or incidental; a secondary feature. Cf. senses A. 1, A. 2.

The action or fact of coming or being added from outside; extrinsic addition; adventitious occurrence. Cf. adventition, n.

More generally: any accidental or non-essential accompaniment, quality, or property; an accessory, a non-essential.

That which is not of the essence or substance: philosophically, the phenomenal part, the sum of the accidents or attributes; sometimes (with plural…

(under-, prefix1 affix 3a(b).)

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

Those aspects of a thing which relate to its mode, or manner or state of being, as distinct from its substance or identity; the non-essential aspect…

Something that is adventitious or extraneous; an accidental. Obsolete.

Something that is extrinsic.

The action or fact of occurring adventitiously; extrinsic addition or influence; accidental or incidental occurrence. Cf. advention, n.

With the. That which is decorative; the non-essential.

That which is inessential.

A thing that is not essential. Usually in plural.