Ap"ro*pos` (#), a. & adv. [F. propos; (L. ad) + propos purpose, L. proposium plan, purpose, fr. proponere to propose. See Propound.]
Opportunely or opportune; seasonably or seasonable.
A tale extremely apropos.
By the way; to the purpose; suitably to the place or subject; -- a word used to introduce an incidental observation, suited to the occasion, though not strictly belonging to the narration.
© Webster 1913.