plural of root of unity

(number theory) An element of a given field (especially, a complex number) x such that for some positive integer n, xⁿ = 1.

plural of registry office

(informal) Synonym of register office (“office for registering births, marriages and deaths”)

Feeling discouraged or melancholy.

plural of coigne of vantage

(law) A written order from a first person that instructs a second person to pay a specified recipient a specific amount of money or goods at a specific time.

(Scotland) An officer of the Scottish sheriff court, responsible for serving documents and enforcing court orders within a sheriffdom.

to not want to be involved in.

(colloquial) Not at all; in no way whatsoever.