A thin opening or groove in something is a slot. You can put letters and postcards through the mail slot at the post office.

A gum ball machine has a slot for inserting a coin, and some front doors have a special slot for mail carriers to put mail in. A screwdriver fits neatly into the slot on top of a screw. Another kind of slot is a space in a schedule or calendar: "I have a half-hour slot on Thursday for our meeting." In the 14th century, a slot was "the hollow above the breastbone."

Definitions of slot

n a small slit (as for inserting a coin or depositing mail)

“he put a quarter in the slot
coin slot
a slot through which coins can be inserted into a slot machine
mail slot
a slot (usually in a door) through which mail can be delivered
Type of:
a long narrow opening

n a time assigned on a schedule or agenda

“the TV program has a new time slot
“an aircraft landing slot
time slot
Type of:
interval, time interval
a definite length of time marked off by two instants

n a position in a hierarchy or organization

“Bob Dylan occupied the top slot for several weeks”
“she beat some tough competition for the number one slot
Type of:
position, status
the relative position or standing of things or especially persons in a society

n (computer) a socket in a microcomputer that will accept a plug-in circuit board

“the PC had three slots for additional memory”
expansion slot
Type of:
an electrical (or electronic) fitting that is connected to a source of power and equipped to receive an insert

n a slot machine that is used for gambling

“they spend hours and hours just playing the slots
one-armed bandit
fruit machine
a coin-operated gambling machine that produces random combinations of symbols (usually pictures of different fruits) on rotating dials; certain combinations win money for the player
Type of:
coin machine, slot machine
a machine that is operated by the insertion of a coin in a slot

n a position in a grammatical linguistic construction in which a variety of alternative units are interchangeable

“he developed a version of slot grammar”
Type of:
position, spatial relation
the spatial property of a place where or way in which something is situated

n the trail of an animal (especially a deer)

“he followed the deer's slot over the soft turf to the edge of the trees”
Type of:
a track or mark left by something that has passed

v assign a time slot

slot a television program”
Type of:
plan for an activity or event

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