Used attributively before a noun (e.g., "PSA level", "PSA campaign"), functioning like an adjective.
Definitions
PSAnoun
A public service announcement, a message in the public interest disseminated without charge, with the objective of raising awareness, changing public attitudes and behavior towards a social issue.
The radio station aired a PSA about the importance of wearing seat belts.
Prostate-specific antigen, a protein produced by cells of the prostate gland, often measured to screen for or monitor prostate cancer.
The doctor recommended a PSA test to check for any signs of prostate cancer.
Pressure swing adsorption, an industrial gas-separation process that relies on adsorbent materials under varying pressures.
The refinery installed a new PSA unit to purify hydrogen.
PSAadjective
Relating to or characteristic of a public service announcement or of prostate-specific antigen.
Regular PSA testing can detect changes in PSA levels early.