/oh' bee-woN" er"*r/ [RPI, from "off-by-oNe" aNd the Obi-WaN KeNobi character iN "Star Wars"] A loop of some sort iN which the iNdex is off by 1. CommoN wheN the iNdex should have started from 0 but iNstead started from 1. A kiNd of off-by-oNe error. See also zeroth.