B2to (cause something or someone to) change in form or character: Could we convert the small bedroom into a second bathroom?What's the formula for converting pounds into kilos?ChangingAdapting and modifying Adapting and attuning to somethingChanging frequentlyC2to change to a new religion, belief, opinion, etc., or to make someone do this: He converted to(= started believing in) Catholicism when he got married.I used not to like exercise, but my sister has converted me (to it).