aproposa. & adv.[F. propos; (L. ad) + propos purpose, L. proposium plan, purpose, fr. proponere to propose. See Propound.]1. Opportunely or opportune; seasonably or seasonable.()A tale extremely apropos. (Pope.)2. 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.()