Present in a minor amount, and not essential.
Having a secondary, supplementary or subordinate function by accompanying as a subordinate; aiding in a secondary way; being additional; contributing or being contributory. Said of things and actions, very rarely of people (and then usually in a humorous version of the legal sense [or due to confusion between the noun and the adjective]).
Assisting a crime without actually participating in committing the crime itself; being connected as an incident or subordinate to a principal.
Something that belongs to part of another main thing; something additional and subordinate, an attachment.
Something in a work of art without being indispensably necessary, for example solely ornamental parts.
An article that completes one's basic outfit, such as a scarf or gloves.
A person who is not present at a crime, but contributes to it as an assistant or instigator.
Insufficient or inadequate in amount.
Lacking something essential; often construed with in.
Of a number n, Having the sum of divisors σ(n)<2n, or, equivalently, the sum of proper divisors (or aliquot sum) s(n).
A person who is deficient.