(of quantities) imprecise but fairly close to correct; "lasted approximately an hour"; "in just about a minute"; "he''s about 30 years old"; "I''ve had about all I can stand"; "we meet about once a month"; "some forty people came"; "weighs around a hundre
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displacement_reaction means
(chemistry) a reaction in which an elementary substance displaces and sets free a constituent element from a compound; ... more