O.C.
Philately.
1.
original cover.
1.
Architecture. on center. See (def 30).
2.
in the work cited.
Latin opere citato (in the work cited)
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[oh-kuh] /ˈoʊ kə/ noun 1. a wood sorrel, Oxalis tuberosa, of the Andes, cultivated in South America for its edible tubers. 2. a tuber of this plant. /ˈəʊkə/ noun 1. any of various South American herbaceous plants of the genus Oxalis, cultivated for their edible tubers: family Oxalidaceae Obsessive Compulsive Anonymous
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On-Line Cryptanalytic Aid Language. [“OCAS: On-line Cryptanalytic Aid System”, D.J. Edwards, MAC-TR-27, MIT Project MAC, May 1966. Sammet 1969, p.642].