From Longman Dictionary of Contemporary Englishon demandon demandformalASK FOR something/ASK somebody TO DO something whenever someone asks Should you feed your baby on demand, or stick to a timetable? → demand
Examples from the Corpus
on demand• Rahmer is opposed to abortion on demand.From Longman Business Dictionaryon demandon deˈmand adverb American English FINANCE if money is lent on demand, it must be repaid immediately if the lender asks for itSYNAT CALL, ON CALL BrE 