buoyant force Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. the upward force on an object in a fluid. Example Sentence Because of buoyant force it is easier to lift someone in the swimming pool. More Example Sentences Fish can swim thanks to buoyant force. Synonyms upthrust; lift; support Hear It! Say It! Write It! buoyant force Switch to cursive Start Share with your friends: