Definition of area code noun from the Oxford Advanced Learner's Dictionary

the numbers for a particular area or city, which you use when you are making a telephone call from outside the local area The area code for New York is 212. compare dialling code Wordfinderarea code, call, dial, engaged, hold, line, message, phone, ring off, voicemail See related entries: Phone services, Making calls
See the Oxford Advanced American Dictionary entry: area code