A position or time in a schedule, plan, etc.: I can slot you in at 2 p.m.
A machine that accepts cash or paper tickets with barcodes, which is activated by a lever or button (either physical or on a touchscreen) to spin and re-arrange symbols in combinations that can earn the player credits according to the paytable. Some slots may allow the player to choose which paylines they wish to wager on, while others automatically place a bet on all available paylines. Symbols vary by game, but classic symbols include fruit, bells, and stylized lucky sevens. A slot machine can also incorporate bonus games and other features that align with its theme.
In aviation, a slot is an allocated time and space for an aircraft to take off or land, assigned by the air traffic control system of an airport or another authority. A slot is often determined by the size of the runway and other factors.
A slot in a web application is a dynamic placeholder that either waits for content (a passive slot) or receives a call from a renderer to fill the slot with content (an active slot). The use of slots and renderers allows developers to create web applications that are responsive and customizable.