| cogitate | (verb) use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments | Synonyms: cerebrate, think |
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| (verb) consider carefully and deeply; reflect upon; turn over in one's mind | - |
| excogitate | (verb) reflect deeply on a subject | Synonyms: chew over, contemplate, meditate, mull, mull over, muse, ponder, reflect, ruminate, speculate, think over |
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| (verb) come up with (an idea, plan, explanation, theory, or principle) after a mental effort | Synonyms: contrive, devise, forge, formulate, invent |