vectors Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. 1 quantity having magnitude and direction; 2 an organism such as a mosquito that spreads pathogens from one host to another; 3 the direction followed by an airplane Example Sentence The two vectors are orthogonal. Synonyms heading; bearing; direction Antonyms piece of pizza Hear It! Say It! Write It! vectors Switch to cursive Start Share with your friends: