~ 1
■ abbreviation ~ian(s).
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~ 2
■ noun informal a political ~ical.
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~ 3
■ noun Physics a unit of absorbed dose of ionizing ~iation, corresponding to the absorption of 0.01 joule per kilogram of absorbing material.
Origin
early 20th cent.: acronym from ~iation absorbed dose .
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~ 4
■ adjective informal, chiefly N. Amer. excellent.
Origin
1980s: prob. an abbrev. of ~ical .
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~ 5
■ noun a ~iator.