Original sense is rare or obsolete in Modern English; sense of "narrow opening into which something else can be fitted" is first recorded 1520s.
Meaning "middle of the (semi-circular) copy desk at a newspaper," the spot occupied by the chief sub-editor, is recorded from 1917.
The sense of "opening in a machine for a coin to be inserted" is from 1888 (The plate burped and a slip dropped out of the slot below it.
For a moment she paused irresolute; then she dropped the coin in the slot.
Bill Joseph is the luckiest man that ever tapped a slot machine.
The blade lies in a slot and is held tight by the tapered ferrule.
He had therefore to be content with observation through the slot.
Some caps are now made with the buttonhole at the upper end of the slot.
In one side of this cap is a slot from the outside to the center, which permits the 2-in.
Hawkes took a coin from his pocket and dropped it in a slot at the side of the board.“After you have dropped your penny in the slot,” remarked Mr. I reached the top of the duct and pushed against the slot cover.
The slots (Canadian and American English), poker machine/pokies (Australian English and New Zealand English), or simply slot (British English and American English), is a casino gambling machine with three or more reels which spin when a button is pushed.
Slot machines are also known as one-armed bandits because they were originally operated by one lever on the side of the machine, as distinct from a button on the front panel, and because of their ability to leave the player impoverished or in debt, with bandit as a synonym for "thief".