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 more rtp live. 4,000 slots, mostly white-collar, might be eradicated from the company’s Missouri plant alone. The board elected a model new director to fill one of the slots.