Oxbridge is a word that is used to mean the University of Oxford and the University of Cambridge in England. It used to mean a fictional mix of the two universities, but now refers to both in real life.
The word 'Oxbridge' started because the two universities are very similar:
The competition between Oxford and Cambridge also has a long history, dating back to the days when Cambridge was founded by unsatisfied scholars from Oxford.
Originally: a fictional university, esp. regarded as a composite of Oxford and Cambridge. Subsequently also (now esp.): the universities of Oxford and Cambridge regarded together, esp. in contrast to other British universities. adj Of, relating to, characteristic of, or reminiscent of Oxbridge (freq. with implication of superior social or intellectual status