Yes—in many reactions, gaining oxygen goes hand-in-hand with losing electrons, which is why both describe oxidation. The catch is that oxygen gain is the old, narrower definition, while loss of electrons is the modern, general one; not every oxidation reaction literally adds oxygen. Chemistry LibreTexts explains both definitions, and The Physics Classroom gives the clean “oxidation is loss” version. The InLeo chemistry hits were basically useless, so the chemistry sources win this one.
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