commūnĭcātĭo (noun F) : communico (several times in Cic., elsewh. rare)
* A making common, imparting, communicating.
* In gen.: largitio et communicatio civitatis,Cic. Balb. 13, 31: quaedam societas et communicatio utilitatum,id. Fin. 5, 23, 65: consilii,id. Fam. 5, 19, 2: sermonis,id. Att. 1, 17, 6: criminis cum pluribus, Tiro ap. Gell. 7, 3, 14: nominum,i. e. the like appellation of several objects,Plin. 24, 14, 80, § 129: juris,Dig. 23, 2, 1: damni,ib. 27, 3, 1, § 14.
* In rhet., a figure of speech, = ἀνακοίνωσις, in accordance with which one turns to his hearers, and, as it were, allows them to take part in the inquiry, Cic. de Or. 3, 53, 204; Quint. 9, 1, 30; 9, 2, 20 and 23.

s. TLL