1.Definition: (sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence

"Incidental expenses", "The road will bring other incidental advantages", "Extra duties incidental to the job", "Labor problems incidental to a rapid expansion", "Confusion incidental to a quick change"

Related Adjective(s):incident

2.Definition: not of prime or central importance

Related Adjective(s):accidental, nonessential

3.Definition: occurring with or following as a consequence

"Snags incidental to the changeover in management"

Related Adjective(s):accompanying, attendant, collateral, concomitant, consequent, ensuant, resultant, sequent