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The abbreviation cf. is short for the Latin word confer, meaning "compare".
e.g. cf. "Latin: q.v.".
Abbreviated: a.m. & p.m., cf., e.g., et al., etc., i.e., N.B., P.S., Q.E.D., q.v., viz.
Non abbreviated: ad hoc, de facto, modus operandi, non sequitur, pro rata, quid pro quo, sic, vice versa.