This is the British English definition of slot.View American English definition of slot. Definition and synonyms of slot from the online English dictionary from Macmillan Education. Quizzes Take our quick quizzes to practise your vocabulary. Choose from collocations, synonyms, phrasal verbs and extra rtp slot. four,000 slots, mostly white-collar, could be eliminated from the company’s Missouri plant alone. The board elected a new director to fill one of the slots.