period Get Printable Handwriting (pe-ri-od) 3 syllables Rhymes Learn It! Spelling Test Definition noun. 1 the point used to mark the end as of a declarative sentence or an abbreviation 2 an amount of time Example Sentence Put a period at the end of your sentence. OR He had a period of illness. Synonyms point; ending punctuation mark; time; spell Antonyms comma Rhymes Three Syllable Rhymes (2) myriad period Share with your friends: