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What does PSA mean?

Looking for the meaning or definition of the word PSA? Here's what it means.

Initialism
  1. prostate-specific antigen
  2. public service announcement
  3. pressure swing adsorption
  4. Pacific Southwest Airlines
  5. polysialic acid
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Examples
The PSA promised to suspend industrial action if employers discontinued the lockout.
Men middle-aged and older routinely get blood tests for prostate-specific antigen, or PSA, to screen for prostate cancer.
Along with his world-class Mantle collection, Spence also owns one of the greatest amassments of PSA graded cards in existence.
Visa problems first surfaced for PSA squash players at the US Open last December in Boston.
The difference is that the PSA wants automatic progression to the top pay rates for community nurses.
Now, after experimenting with a number of low-key pro exhibition events and small invitationals, the Orange County Squashers are introducing a PSA Challenger Event.

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