Thank  —v. 1 express gratitude to (thanked him for the present). 2 hold responsible (you can thank yourself for that). —n. (in pl.) 1 gratitude. 2 expression of gratitude. 3 (as a formula) thank you (thanks for your help).  thank goodness (or god or heavens etc.) Colloq. Expression of relief etc. Thanks to as the result of (thanks to my foresight; thanks to your obstinacy). Thank you polite formula expressing gratitude. [old english]