What is another word for "indication"?

Roget's Thesaurus (1911) lists these synonyms for "indication": acknowledge, acknowledgment, answer, antiphon, antiphony, augury, auspice, because, bird, candle, cause, clue, conclusive, counter, determine, discover, discovery, echo, eureka, explain, explanation, fathom, for, gathering, give, harbinger, hunt, ill, ill-boding, inquire, interpret, omen, oracle, out, password, portent, precursor, prefigurement, presage, prognostic.