Particular means specific or special, referring to one exact thing or detail. It can also describe someone who is very picky or careful about what they like or accept.
From Old French 'particulier', from Latin 'particularis' meaning 'of a part', from 'pars' meaning 'part'. It moved from meaning 'individual' to 'specific and detailed'.
When you say 'this particular problem', you’re literally saying 'this problem as its own separate part'. The word turns the huge mess of reality into neat, zoomed-in pieces we can actually talk about.
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