From Longman Dictionary of Contemporary Englishcallercall‧er /ˈkɔːlə $ ˈkɒːlər/ noun [countable] 1 TCTsomeone making a telephone call ‘Could you hold for one moment?’ he asked the caller.2 VISIT old-fashioned someone who visits your house
Examples from the Corpus
caller• Hold on please, I have an overseas call for you. Go ahead, caller.• When that happens, dialing the wrong area code could connect callers with the wrong home or business.• I don't seem to have many callers these days.• When answering the door, always check the identity of callers.• Some callers immediately show their true colors.• Did the caller leave a number?• I hope the caller was impressed.• Sheffield said the callers would sometimes describe to him what he did that day.• Didn't the caller say who she was?• The caller complained about racial slurs made by co-workers at the company.• The caller was still on the line, Rain had to give him her attention.• The caller claimed three incendiary devices had been planted at the Vineyards.From Longman Business Dictionarycallercal‧ler /ˈkɔːlə-ər/ noun [countable] the person who makes a phone callThe caller didn’t leave their number. 