unus, -a, -um
one Numbers & Time
Credo in unum Deum (I believe in one God). E pluribus unum (Out of many one) — US motto
In Scripture
Erat autem Andreas, frater Simonis Petri, unus ex duobus qui audierant a Joanne, et secuti fuerant eum.
And Andrew, the brother of Simon Peter, was one of the two who had heard of John and followed him.
Ioannes 1 · 40