Synonyms: devise, contrive, excogitate, forge, formulate, invent
Definition: come up with (an idea, plan, explanation, theory, or principle) after a mental effort
Usage: excogitate a way to measure the speed of light
Similar words: create by mental act, create mentally
Definition: create mentally and abstractly rather than with one's hands
Synonyms: cook up, fabricate, invent, make up, manufacture
Definition: make up something artificial or untrue
Similar words: concoct, dream up, hatch, think of, think up
Definition: devise or invent
Usage: He thought up a plan to get rich quickly; no-one had ever thought of such a clever piece of software