PhD. Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. abbreviation for Doctor of Philosophy; an American doctorate usually based on at least 3 years graduate study and a dissertation Example Sentence He received a PhD. from Harvard. Synonyms Doctor of Philosophy; doctorate; PhD Antonyms kindergarten graduation Hear It! Say It! Write It! PhD. Switch to cursive Start Share with your friends: