immensĭtas (inm-), ātis, f. [immensus],
immeasurableness , immensity (Ciceron.): latitudinum, longitudinum, Cic. N. D. 1, 20, 54: immensitates camporum, id. ib. 2, 39, 98.
immēnsitās (inm-) ātis, f immensus, immeasurableness, immensity : latitudinum.—Plur: camporum. ...
An Elementary Latin Dictionary