A succession of connected ideas, a path of reasoning, as in You've interrupted my train of thought; now what was I saying? This idiom, which uses train in the sense of "an orderly sequence," was first recorded in 1651, in philosopher Thomas Hobbes's Leviathan.
school of thought
The point of view held by a particular group: “We have many schools of thought in the intelligence services” (Tom Clancy). [ karenR's advice column | Ask karenR A Question ]
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