eff.

A form of effective — Having the power to produce a required effect or effects.

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Meanings

adjectiveeff. (not comparable)
  1. abbreviationnot comparableAbbreviation of effective (“taking effect on a given date etc.”)
Cite this entry
APA

eff.. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/eff.

MLA

“eff..” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/eff.. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “eff.,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/eff..

Source: eff. on Wiktionary, CC BY-SA 4.0.