Meaning of “fierce” in the English Dictionary

"fierce" in British English

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fierceadjective

uk /fɪəs/ us /fɪrs/

B2 physically violent and frightening:

a fierce attack/battle
Two men were shot during fierce fighting last weekend.

B2 strong and powerful:

Fierce winds prevented the race from taking place.
Firefighters had to retreat from the fierce heat.

B2 showing strong feeling or energetic activity:

There is fierce competition to join the Special Branch.

US informal difficult:

The chemistry exam was fierce!

More examples

fierceness
noun [ U ] uk /ˈfɪəs.nəs/ us /ˈfɪrs.nəs/

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

"fierce" in American English

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fierceadjective

us /fɪərs/

violent and forceful:

The city had been under fierce attack.

Fierce can also mean severe or extremely strong:

She’s a fierce critic of US policies.
He was a fierce competitor.

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