lifetimes Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition plural noun. the length of time a person or thing lives. Example Sentence We can learn a lot from the experiences of previous lifetimes. More Example Sentences Some trees can have long lifetimes. Synonyms ages; durations; spans Antonyms moment; instant Hear It! Say It! Write It! lifetimes Switch to cursive Start Share with your friends: