Standard Lemma guide

SecDef

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • /ˈsɛkˈdɛf/

1

noun

Meaning 1

Alternative form of SECDEF

Definition source: English Wiktionary via Wiktextract

Usage: alt-of, alternative

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

The United States Defense Secretary, the civilian head of the Department of Defense of the United States of America, a cabinet secretary.

Definition source: English Wiktionary via Wiktextract

Usage: US

Qualifier: titles

Topics: government, military, politics, war

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Abbreviation of Secretary of Defense.