Definition of unless :
Upon any less condition than ( the fact or thing stated in the sentence or clause which follows); if not; supposing that not; if it be not; were it not that; except; as, we shall fail unless we are industrious.
except that, if not, without the provision that, excepting that, except
- In that case I shall hardly see you unless I go to see you. - "The George Sand-Gustave Flaubert Letters", George Sand, Gustave Flaubert Translated by A.L. McKensie.
- I saw my mother still less; scarcely ever, unless she had to punish me. - "A Struggle for Rome, Vol. 2 (of 3)", Felix Dahn.
- Unless- oh, Lord John, if you could only put me in the way of an engagement, no matter how small. - "Lord John in New York", C. N. Williamson A. M. Williamson.