Brilliant business name based on the word "define".
The name "definely" has eight characters and three syllables. Established brands using three syllable names include Mastercard, Microsoft and Grammarly.
Definely.com is a dot-com domain. Dot com domains are the most sought after domain extension in the world, famously used by websites like facebook.com. Once secured, a dot-com all but guarantees no-one else can outrank you for your own name in the long run.