This time slot has been already booked error

noun a small slit · noun a time assigned on a schedule or agenda · noun a position in a hierarchy or organization

From Longman Dictionary of Contemporary Englishslotslot1 slɒt $ slɑːt ○○○ S3 noun 1 HOLEa long narrow hole in a surface, that you can put

slot machine par sheet IPA : · 1 a position in a grammatical linguistic construction in which a variety of alternative units are interchangeable · 2 a small slit (as for inserting

slot m88 Slot : 1 A long, narrow aperture or slit in a machine for something to be : He slid a coin into the slot of the