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...t of a crowded city and into other towns or villages near the city: . Learn more. Define overspill. overspill synonyms, overspill pronunciation, overspill translation, English dictionary definition of overspill. n. 1. The fact or process of spilling over. 2. Something that spills over: an overspill of milk. 3. Chiefly British Movement of people from overcrowded... Overspill definition is - the act or an instance of spilling over. How to use overspill in a sentence. Applying overspill, we obtain a positive appreciable δ with the requisite properties. These equivalent conditions express the property known in non-standard analysis as S-continuity (or microcontinuity) of ƒ at x. S-continuity is referred to as an external property. 'An overspill from the pub sat on the wall opposite with pints and ghetto-blasters and a dozen pairs of runners hung by their laces from the telegraph wires overhead.' 'Be it climate change, landfill overspill, or any other problem the time is here to hit the f...