complement
The totality, the full amount or number which completes something.
Other meanings
The whole working force of a vessel.
An angle which, together with a given angle, makes a right angle.
Word history
From Latin "complēmentum" (that which fills up or completes).
Where this comes from
This definition is adapted from “complement” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.