Adverb
Two times; once and again.
Doubly; in twofold quantity or degree; as, twice the sum; he is twice as fortunate as his neighbor.
Source: Webster's dictionaryNature has given to men one tongue, but two ears, that we may hear from others twice as much as we speak. Epictetus
You cannot step into the same river twice. Heraclitus
Everything that happens once can never happen again. But everything that happens twice will surely happen a third time. Paulo Coelho
A diplomat must always think twice before he says nothing. Irish Proverb
To marry one is a duty; twice a folly; thrice is madness. Dutch Proverb
Work is twice done by the man in a hurry. Persian Proverb