English Lexicon

Key function

/kiː ˈfʌŋk.ʃən/
nounCEFR B2 (Upper)Top #2500 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    The most important or essential role, duty, or operation performed by a system, device, or person.

    "Data security is a key function of the new network architecture."
  2. 2

    A primary capability or feature that distinguishes a product or program and delivers its core value.

    "The key function of this software is automated financial forecasting."

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Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

The term combines the Old English 'cæg' (key), meaning an instrument for locking or solving, with the Latin 'functio' (performance, execution), derived from 'fungi' (to perform). Together in modern administrative and technical contexts, it denotes a primary or indispensable operational role.

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