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over-
1 too much : 
overpopulationovercooked vegetables overweight
overpopulationovercooked vegetablesoverweight2 above; beyond; across : overhanging branches overhead telephone wires the overland route (=not by sea or air)
overhanging branchesoverhead telephone wiresthe overland route (=not by sea or air)3 outer : an overcoat
an overcoat4 additional : We were working overtime. (=working beyond the usual time)
We were working overtime. (=working beyond the usual time)