cer - tian - ly

cer = an emotional response that has been acquired by conditioning.

tian = 1. household French gratin dish: a square or rectangular French casserole dish originally used for baking foods au gratin; 2. food dish baked in tian: a dish that is baked in a tian [Mid-20th century. Via Provençal < Greek t&#275;ganon "frying pan"]

ly = adverbial suffix.

Therefor, as anybody but that ignoramus eta would know, "certianly" means an action conditioned by an emotional response produced by being cooked in a French gratin dish.