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.
boast. vb. 1. (intr; sometimes foll by of or about) to speak in exaggerated or excessively proud terms of one's possessions, skills, or superior qualities; brag. 2. (tr) to possess (something to be proud of): the city boasts a fine cathedral.