Adjective
1. important in effect or meaning;
"a significant change in tax laws""a significant change in the Constitution""a significant contribution""significant details""statistically significant"2. fairly large;
"won by a substantial margin"3. 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"4. rich in significance or implication;
"a meaning look""pregnant with meaning"