Significant

Fitted or designed to signify or make known somethingl having a meaning; standing as a sign or token; expressive or suggestive; as, a significant word or sound; a significant look.

Deserving to be considered; important; momentous; as, a significant event.

That which has significance; a sign; a token; a symbol.

of considerable importance, size, or worth; "won by a substantial margin"

too closely correlated to be attributed to chance and therefore indicating a systematic relation; "the interaction effect is significant at the .01 level"; "no significant difference was found"