S / singŭlārĭtas
noun

singŭlārĭtas

gen. ātis · gender feminine · decl. 3rd
singularis.
a being alone; single; singleness
In gen., a being alone or single, singleness (post-class.), Tert. adv. Valent. 37; id. Anim. 13; id. Exhort. ad Cast. 1; Salv. Cont. Avar. 7, p. 70.—
the singular number
In partic., in gram., the singular number, Charis. p. 72 P.—
unity; the number one
In arithmetic, unity, the number one: singularitas omnibus mensura communis, Mart. Cap. 7, §§ 750 and 774.