Used to request repetition of a question, order, etc.: ‘I beg your pardon’, ‘what did you say?’, ‘eh?’. Now rare (archaic and regional in later use).

a day on which no legal business can be done, or which does not count for legal purposes

but not too much

allegro ma non troppo

not having full control of one's mind; not sane or rational

a plea that a written agreement is invalid because the defendant was mistaken about its character when signing it

not lawful

a negative vote in a Church or university assembly

a source of pollution that issues from widely distributed or pervasive environmental elements

cattle are the leading non-point source of pollution in Canada today

used as a statement expressing inability to act in a matter

a form of competition in which two or more producers use such factors as packaging, delivery, or customer service rather than price to increase demand for their products

a conclusion or statement that does not logically follow from the previous argument or statement

his weird mixed metaphors and non sequiturs

a colour simulated by a pattern of dots of other colours, extending the range of colours available

inflammation of the urethra due to infection by chlamydiae or other organisms (other than gonococci)

an individual or organization that has significant political influence but is not allied to any particular country or state

an unacceptable or unwelcome person

he was persona non grata with the regime

an essential condition; a thing that is absolutely necessary

grammar and usage are the sine qua non of language teaching and learning