Definition of significant adjective from the Oxford Advanced Learner's Dictionary

        

    significant

     adjective
    adjective
    BrE BrE//sɪɡˈnɪfɪkənt//
     
    ; NAmE NAmE//sɪɡˈnɪfɪkənt//
     
    Experiments and research
     
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  1. 1  large or important enough to have an effect or to be noticed a highly significant discovery The results of the experiment are not statistically significant. There are no significant differences between the two groups of students. Your work has shown a significant improvement. These views are held by a significant proportion of the population. It is significant that girls generally do better in examinations than boys. The drug has had no significant effect on stopping the spread of the disease. compare insignificant See related entries: Experiments and research
  2. 2  having a particular meaning It is significant that he changed his will only days before his death.
  3. 3[usually before noun] having a special or secret meaning that is not understood by everyone synonym meaningful a significant look/smile
  4. Word Origin late 16th cent. (in sense (2)): from Latin significant- ‘indicating’, from the verb significare ‘indicate, portend’, from signum ‘token’.Extra examples These differences are not statistically significant. This development proved highly significant for the whole town. What makes this discovery significant is that it goes against our theory. rituals which are deeply significant to Christians It is significant that girls generally do better in examinations than boys. The results of the experiment are not statistically significant. This is a highly significant discovery.
See the Oxford Advanced American Dictionary entry: significant