significant
Pronunciation: /sɪgˈnɪfɪk(ə)nt/
adjective
- 1sufficiently great or important to be worthy of attention; noteworthy: a significant increase in sales

Origin:
late 16th century (in significant (sense 2)): from Latin significant- 'indicating', from the verb significare (see signify)

Spelling help
The ending of significant is spelled -ant.