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English definition of “sub-”

sub-

prefix uk   /sʌb-/ us  

sub- prefix (BELOW)

under or below: Winter weather brought sub-zero (= less than 0 degrees) temperatures to much of the country.Under and below

sub- prefix (NOT QUITE)

almost or nearly: subhuman subtropicalAlmostMerely and barely

sub- prefix (NOT EQUAL)

less important or lower in rank: a sub lieutenant a subordinateOf little or less importance

sub- prefix (SMALLER)

being a smaller part of a larger whole: a subcontinent a subcommittee meeting to subdivideWords meaning parts of things
(Definition of sub- prefix from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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