certainly

Adverb

1. In a way which is certain; with certainty.
   • he verily thought he had young live frogs in his belly, qui vivebant ex alimento suo, that lived by his nourishment, and was so certainly persuaded of it, that for many years following he could not be rectified in his...
   • The torque was "built up" in the special back axle and the car crawled tankwise but very certainly over the obstacles without a jar or hesitation. - 1923, A. A. Hill, Automobile Dealer and Repairer, page 30:
2. Without doubt, surely.
   • The accident was certainly caused by human error.
   • That was certainly sweet of him.
   • 'I'm all grown up now' -'You certainly have (grown)!'
3. An emphatic affirmative answer; of course.
   • Would you like it with ice? Certainly, and with lemon please.