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ef-

American  
  1. variant of ex- (by assimilation) before f: efficient.


Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

EF took in the kindergartners through sixth-grade students from Saint Mark’s, an Episcopal school, after it burned down in the Eaton fire.

From Los Angeles Times • May 23, 2026

“It’s been a game changer,” says Anna Carceller, a doctor and the head of nutrition at EF Pro Cycling.

From The Wall Street Journal • Apr. 28, 2026

Technically, it has shown standout relative strength against medical equipment peers, as the ratio chart versus the iShares medical device EF has trended higher all year.

From Barron's • Dec. 9, 2025

The climb started 43km from the finish and within a kilometre, Carapaz's EF Education team attacked.

From BBC • May 31, 2025

These dots are then joined by the line EF.

From The Social Direction of Evolution An Outline of the Science of Eugenics by Kellicott, William E.

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