(adjective) : adventīcĭus (not -tĭus), a, um, advenio
* That is present by coming, coming from abroad, foreign, strange (extrinsecus ad nos perveniens non nostrum, aut nostro labore paratum, Ern. Clav. Cic.; opp. proprius, innatus, insitus, etc.; in Cic. very freq., elsewhere rare).
* In gen.: genus (avium),Varr. R. R. 3, 5, 7 (cf. advena): Mithridates magnis adventiciis copiis juvabatur,Cic. Imp. Pomp. 9, 24; so, auxilium,Cic. Verr. 2, 4, 37: externus et adventicius tepor,id. N. D. 2, 10: externa atque adventicia visio,proceeding from the senses,id. Div. 2, 58, 128: doctrina transmarina et adventicia,id. de Or. 3, 33: dos,given by another than the father,Dig. 23, 3, 5.
* Esp.
* That is added to what is customary, or happens out of course, unusual, extraordinary: fructus,Liv. 8, 28; so, casus,Dig. 40, 9, 6.
* That is acquired without one's own effort: adventicia pecunia, obtained, not from one's own possessions, but by inheritance, usury, presents, etc., Cic. Inv. 2, 21; id. Rab. Post. 17: humor adventicius,rain,Varr. R. R. 1, 41, 3: adventiciae res,Sen. ad Helv. 5.
* That pertains to arrival (adventus): adventicia cena,a banquet given on one's arrival,Suet. Vit. 13 (cf. adventorius).—Adv. phrase: ex adventicio, from without, extrinsically: quidquid est hoc, quod circa nos ex adventicio fulget, liberi, honores, etc.,Sen. Consol. ad Marc. 10.

s. TLL