In an accidental manner; by chance, unexpectedly. / Unintentionally.

Pertaining to accident and not essence; thus, inessential; incidental; secondary. / (philosophy) Nonessential to something's inherent nature (especially in Aristotelian thought).

A property which is not essential; a nonessential; anything happening accidentally.

The quality of being accidental; casualness.

The quality of being accidental; accidentalness.

Accidental character or effect. / The belief that outward appearance often contrasts with substance or essence (after Thomas Aquinas).

plural of accidental

Deliberately, though apparently accidentally.

Alternative form of accidentally on purpose

(perspective) A point on the horizon at which two parallel lines appear to meet.