Meaning of “ambitious” in the English Dictionary

"ambitious" in British English

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ambitiousadjective

uk /æmˈbɪʃ.əs/ us /æmˈbɪʃ.əs/

B2 having a strong wish to be successful, powerful, or rich:

an ambitious young lawyer
He's very ambitious for his children (= he wants them to be successful).

B2 If a plan or idea is ambitious, it needs a great amount of skill and effort to be successful or be achieved:

She has some ambitious plans for her business.
The government has announced an ambitious plan to modernize the railway network.
The original completion date was over-ambitious, so we have had to delay the opening.

More examples

ambitiously
adverb uk /æmˈbɪʃ.əs.li/ us /æmˈbɪʃ.əs.li/

(Definition of “ambitious” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ambitious" in American English

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ambitiousadjective

us /æmˈbɪʃ·əs/

having a strong desire for success, achievement, power, or wealth:

Even as a young man he was ambitious and self-assured.

If you describe an activity as ambitious, you mean that it involves a lot of effort or expense:

It was an ambitious project to restore the public parks.

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

"ambitious" in Business English

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ambitiousadjective

uk /æmˈbɪʃəs/ us

having a strong wish to be successful:

an ambitious young lawyer
I make no secret of the fact that I am very ambitious.

if a plan or idea is ambitious, it needs a lot of skill and effort to be successful or be achieved:

The retailer announced ambitious plans yesterday as it reported profits up 19%.
The government has announced an ambitious programme to modernize the railway network.
Their goals proved to be a little too ambitious.
ambitiously
adverb /æmˈbɪʃəsli/

The company had expanded ambitiously into Europe.

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