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 fast quizzes to practise your vocabulary. Choose from collocations, synonyms, phrasal verbs and extra rtp live. four,000 slots, mostly white-collar, might be eradicated from the company’s Missouri plant alone. The board elected a brand new director to fill one of the slots.