accessio, ōnis, f. accedo, a going or coming to or near, an approach. In gen.: quid tibi in concilium huc accessio est? why comest thou hither? Plaut. Trin. 3, 2, 86; cf.: quid tibi ad hasce accessio est aedīs prope? id. Truc. 2, 2, 3; Cic. Univ. 12: ut magnas accessiones fecerint in operibus expugnandis, sallies, Caes. B. Alex. 22: suo labore suisque accessionibus, i. e. by his labor of calling on people, by his visits, Cic. Verr. 2, 2, 53 fin.

— In part. In medicine, t. t., the access, attack, or paroxysm of a disease, Cels. 2, 12; 3, 3 sq.; Sen. Ep. 85, 12; id. N. Q. 6, 18, 6; Suet. Vesp. 23 al.

— A coming to in the way of augmentation, an increase, addition. In abstracto: paucorum annorum, Cic. Lael. 3, 7: pecuniae, Nep. Att. 14, 2: fortunae et dignitatis, Cic. Fam. 2, 1; 7, 6; 10, 9; id. Rep. 2, 21: odii, Caes. B. Alex. 48: dignitatis, Vell. 2, 130 fin.

— The thing added, the addition, or accession: in concreto: Scaurusaccessionem adjunxit aedibus, added a new part, Cic. Off. 1, 39, 138; so id. Att. 16, 16. Thus Syphax is called, accessio Punici belli, as not being the chief enemy in the Punic war, but, as it were, an appendage to the war, Liv. 47, 7; so in Pliny: turbā gemmarum potamus

—et aurum jam accessio est, and gold is only accessory, a mere appendage, 33 prooem. fin.

— In rhetor., an addition that makes a definition complete: nisi adhiberet illam magnam accessionem, Cic. Ac. 2, 35, 112; so id. Fin. 2, 13.

— The addition to every kind of fee or tax (opp. decessio), Cato R. R. 144: decumae, Cic. Rab. 11; so Cic. Verr. 2, 3, 33, § 116 al.