nŭmĕrōsĭtas — Lewis & Short
nŭmĕrōsĭtas, ātis, f.numerosus.
I A great number, multitude (post-class.):
numerositas innumera,Macr. S. 5, 20:
filiarum,Tert. Monog. 4:
curialium, Cod. Th. 12, 5, 3: Scriptorum,Sid. Carm. 23, 150.—
II Rhythm, harmony, Aug. Doctr. Christ. 4, 20; id. ib. 55, 109.