Definitions
1.AdjectiveSignifying something; carrying meaning."a significant word or sound; a significant look"
2.AdjectiveHaving a noticeable or major effect."That was a significant step in the right direction.; The First World War was a significant event."
3.AdjectiveReasonably large in number or amount.
4.AdjectiveHaving a covert or hidden meaning.
5.AdjectiveHaving a low probability of occurring by chance (for example, having high correlation and thus likely to be related).
6.AdjectiveOf a digit or figure, see significant figure.
7.NounThat which has significance; a sign; a token; a symbol.