Meaning of “undertaking” in the English Dictionary

"undertaking" in American English

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undertakingnoun [ C usually sing ]

us /ˈʌn·dərˌteɪ·kɪŋ/

an effort to do something, esp. to do a large or difficult job, or the job that is done:

Preparing for the US national census every ten years is a massive undertaking.

(Definition of “undertaking” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"undertaking" in Business English

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undertakingnoun [ C ]

uk /ˈʌndəˌteɪkɪŋ/ us

a job, task, or piece of work that someone has decided or agreed to do:

a big/enormous/major undertaking This is an enormous and most ambitious undertaking.

formal a formal promise:

an undertaking to do sth Many banks have given undertakings to lend more.
an undertaking that Both companies gave an undertaking that they will stop discounting.

formal a business:

IOC is India's largest commercial undertaking.
90% of the investment portfolio comprised investment in the securities of the associated undertakings.

(Definition of “undertaking” from the Cambridge Business English Dictionary © Cambridge University Press)