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I found this phrase "a degree of stress" in M-W's Col. Dic. 'Stress' isn't a countable noun, I mean someone can't have two 'stresses'. Then, why is M-W an indefinite article "a" with it?
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Hi,
Because you can have a degree of stres

Jus like a glass of water.

Clive
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Thanks, Clive.

But could someone have three degrees of stress or something like it? Please help me.
Hi,
Sounds a bit odd, but it is not incorrect gramar.

Yu can incease the heat by three degrees.

Clive