Definitions
1.nounThat which has significance; a sign; a token; a symbol.
2.adjectiveSignifying something; carrying meaning."a significant word or sound; a significant look"
3.adjectiveHaving a covert or hidden meaning.
4.adjectiveHaving a noticeable or major effect; notable."That was a significant step in the right direction."
5.adjectiveReasonably large in number or amount.
6.adjectiveHaving a low probability of occurring by chance (for example, having high correlation and thus likely to be related).