smartphone Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a mobile phone that performs many functions like a computer. Example Sentence I just bought a new smartphone. More Example Sentences Many people use a smartphone every day. Synonyms cell phone; mobile; device Antonyms landline; rotary phone Hear It! Say It! Write It! smartphone Switch to cursive Start Share with your friends: