While the average size of a mattress used to be 6 inches, maybe 8 inches if it was plush, now innerspring mattresses routinely clock in at 12 - 14 inches-some even more.
Another word for original. adjective. Preceding all others in time: earliest, first, initial, maiden, pioneer, primary, prime, primordial. See start. Arising from or going to the root or source: basal, basic, foundational, fundamental, primary, radical, underlying.
Word Origin and History for antonym. n. 1867, coined to serve as opposite of synonym, from Greek anti- equal to, instead of, opposite (see anti-) + -onym name (see name (n.)). Perhaps introduced to English in the book Synonyms and Antonyms (1867) by the Ven.