Definition of a level A level

We found 3 definitions of a level from 2 different sources.

What does a level mean?

Noun
a level - the advanced level of a subject taken in school (usually two years after O level)
		tier, level, grade one of two or more layers one atop another; "tier upon tier of huge casks"; "a three-tier wedding cake"

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a level (Noun)
A non-compulsory examination taken in the final two years in British high schools.
a level (Noun)
In Internet prostitution, a euphemism for anal sex .