This is the British English definition of slot.View American English definition of slot. Definition and synonyms of slot from the web English dictionary from Macmillan Education. Quizzes Take our fast quizzes to practise your vocabulary. Choose from collocations, synonyms, phrasal verbs and extra rtp live. 4,000 slots, principally white-collar, might be eliminated from the company’s Missouri plant alone. The board elected a new director to fill one of the slots.