first born Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition adjective. ornoun. first in the order of birth; eldest Example Sentence Jaden is the first born of our three daughters. Spelled as two words. Synonyms eldest; oldest; 1st in order of birth Antonyms youngest Hear It! Say It! Write It! first born Switch to cursive Start Share with your friends: