Associated by chance and not an integral part.

Roget 6: derived from without; objective; extrinsic, extrinsical^†; extraneous etc. (foreign) 57; modal, adventitious; ascititious^†, adscititious^†; incidental, accidental, nonessential; contingent, fortuitous.    implanted, ingrafted^†; inculcated, infused.    outward, apparent etc. (external) 220.    ... show more

Roget 8: circumstantial; given, conditional, provisional; critical; modal; contingent, incidental; adventitious etc. (extrinsic) 6; limitative^†.    ... show more

Roget 156: casual, fortuitous, accidental, adventitious, causeless, incidental, contingent, uncaused, undetermined, indeterminate; random, statistical; possible etc. 470; unintentional etc. 621.    ... show more