earthquakes Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a shaking or trembling of the crust of the earth; caused by underground volcanic forces or by breaking and shifting of rock beneath the surface Example Sentence Kansas City experiences infrequent earthquakes. Synonyms tremor; tremblor; quake Antonyms quiet Hear It! Say It! Write It! earthquakes Switch to cursive Start Share with your friends: