Definition of cosmic for English Language Learners. : 1  of or relating to the universe or outer space. : 2  relating to spiritual matters. : 3  very large or important.
Definition of boast. 1 : a statement expressing excessive pride in oneself : the act or an instance of boasting (see 2boast) : brag It may sound like a boast, but I truly am very wealthy.
â¢ Brag. ( 1 adv.) Proudly; boastfully. ( 2 v. t.) To boast of. ( 3 n.) The thing which is boasted of. ( n.) A game at cards similar to 1  bluff. (n.) A boast or boasting; bragging; ostentatious pretense or self glorification. ( v. i.) Brisk; full of spirits; boasting; pretentious; conceited.