Webster's Revised Unabridged Dictionary · 1913

Thrice

Thrice (thrīs) , adverb

[Old English thries; thrie thrice (Anglo-Saxon þriga, þriwa) + -s, the adverbal suffix. See Three, and -wards.]

1.
Three times.
Thrice in vain. — Spenser
Verily I say unto thee. That this night, before the cock crow, thou shalt deny me thrice. — Matt. xxvi. 34
2.
In a threefold manner or degree; repeatedly; very.
Thrice noble lord, let me entreat of you To pardon me. — Shakespeare
Thrice is he armed that hath his quarrel just. — Shakespeare

Thrice is often used, generally with an intensive force, to form compounds which are usually of obvious meaning; as, in thrice-blessed, thrice-favored, thrice-hallowed, thrice-happy, thrice-told, and the like.