Significant

Part of speech: noun (n.)

That which has significance; a sign; a token; a symbol. Wordsworth. In dumb significants proclaim your thoughts. Shak.

Part of speech: adjective (a.)

1. 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. It was well said of Plotinus, that the stars were significant, but not efficient. Sir W. Raleigh.

2. Deserving to be considered; important; momentous; as, a significant event. Significant figures (Arith.), the figures which remain to any number, or decimal fraction, after the ciphers at the right or left are canceled. Thus, the significant figures of 25,000, or of .0025, are 25.