(electronics) A company that is licensed to manufacture and sell electronic components originally designed by another company (the first source).

(physics, meteorology) An extensive area of the Earth's surface over which bodies of air frequently remain for a sufficient time to acquire characteristic temperature and moisture properties imparted by that surface. Air so modified becomes identifiable as a distinct air mass. See airmass.

(computing) The management of changes to files such as source code, documents, large web sites, or other collections of information.

plural of airmass source region

uninterruptible power supply

present participle of open-source

present participle of open source

(business) A form of outsourcing that employs socioeconomically disadvantaged people.

(astronomy) a quasar / (dated) a radio-loud quasar

plural of quasi-stellar radio-source