To think carefully and deeply about something; to ponder or reflect.
From Latin cogitare, meaning 'to think or consider,' possibly from co- (together) and agitare (to drive or move). The word entered English during the Renaissance when Latin scholarly vocabulary was adopted.
The phrase 'I need to cogitate on that' sounds fancy but just means 'let me think about it'—philosophers used this word to make thinking sound more important than it probably was.
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