/ Thesaurus / S Synonyms of stock split Find synonyms for: Noun1. split, stock split, split up, increase, step-upusage: an increase in the number of outstanding shares of a corporation without changing the shareholders' equity; "they announced a two-for-one split of the common stock"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: lyre Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language