Longman Dictionary of Contemporary English homepage

Language: Latin
Origin: sub 'under, close to'

sub-

 prefix
     
sub-
1XX under or below a particular level or thing:
subzero temperatures
subsoil (=beneath the surface)
2 less important or powerful than someone or something, or of lower rank than someone:
a sublieutenant
3 part of a bigger whole:
a subsection
a subcommittee
4 not as good as other people or things:
substandard housing
subnormal intelligence
5 technical almost:
subtropical heat
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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