oxygenise v 1: change (a compound) by increasing the proportion of the electronegative part; or change (an element or ion) from a lower to a higher positive valence: remove one or more electrons from (an atom, ion, or molecule) [syn: {oxygenize}] 2: dehydrogenate with oxygen [syn: {oxygenize}] 3: impregnate, combine, or supply with oxygen; "oxygenate blood" [syn: {oxygenate}, {oxygenize}, {aerate}]