This is a scam – Oxford Dictionary Review

The (real) Oxford English Dictionary is one of the great English works of any kind. This app, however, is simply a fraud. Its App Store title claims it is the "Oxford English Dictionary", but defines only a fraction of the entries in the real dictionary. Hilariously, the app itself demands I rate it 5 stars, and is permeated by tacky ads. It is irritating to see the great work of the OED demeaned by scam artists. I don’t know why the OED publisher puts up with it or why Apple allows this app to be so dishonestly marketed.
Review by kendradog on Oxford Dictionary.