Meaning of “stress” - Learner’s Dictionary

stress

noun uk us /stres/
WORRY [ C, U ]

B1 feelings of worry caused by difficult situations such as problems at work:

work-related stress
Regular exercise can help reduce stress.
She's been under a lot of stress recently.
IMPORTANCE [ U ]

special importance that you give to something:

At school, they laid great stress on academic achievement.
PHYSICAL FORCE [ C, U ]

physical force on something:

Jogging puts a lot of stress on your knee joints.
STRONG PART [ U ]

B2 the emphasis you put on one part of a word:

In the word 'blanket', the stress is on the first syllable.

(Definition of “stress noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)