Main entry: chew over, reflect, ponder, think over, speculate, ruminate, mull, mull over, muse, excogitate, contemplate, meditate
Definition: reflect deeply on a subject
Usage: I mulled over the events of the afternoon; philosophers have speculated on the question of God for thousands of years; The scientist must stop to observe and start to excogitate
Main entry: 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