1 (in Britain) Property Services Agency: the section of the Department of the Environment responsible for providing buildings for government departments and the armed forces
2 prostatic specific antigen: an enzyme secreted by the prostate gland, increased levels of which are found in the blood of patients with cancer of the prostate
3 (in New Zealand) Public Service Association
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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"