What is "obvention"

Obvention \Ob*ven"tion\, n. [L. obvention, fr. obvenire to come before or in the way of, to befall; ob (see Ob-) + venire to come: cf. F. obvention.] The act of happening incidentally; that which happens casually; an incidental advantage; an occasional offering. [Obs.] ``Tithes and other obventions.''
--Spenser.

Legacies bequeathed by the deaths of princes and great persons, and other casualities and obventions.
--Fuller.

n. (context obsolete English) The act of happening incidentally; that which happens casually; an incidental advantage; an occasional offering.