Brilliant business name based on the word "define".
The name "definely" has eight letters and three syllables. Leading companies using three syllable names include McDonald's, Santander and Vodafone.
Definely.com is a dot-com domain. Dot com domains are the most prestigious domain extension in the world, used by famous websites like facebook.com. Once you own a dot-com, it will be much easier to rank for your own name in Google.