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What does X stand for?

X stands for Unknown Quantity (variable)

This definition appears very frequently and is found in the following Acronym Finder categories:

  • Science, medicine, engineering, etc.

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Other Resources:
We have 1 other meaning of X in our Acronym Attic

Samples in periodicals archive:

Firefighters were called to make the vehicle safe and clear drains of the unknown quantity of milk that spilled onto the highway.
The five-year-old is something of an unknown quantity but showed plenty of promise on his only appearance when staying on strongly to finish third in a bumper at the course last November.
Byline: William Carr, Kirkby Think not of unknown quantity if you become a surrogate Think only of the being whose life you will enhance.
Like Dawkins, Chomsky calls himself an unknown quantity, but scientism is not an unknown folly.