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so

conjunction, adverb
 
 
/səʊ/ US  /soʊ/

Definition

B1 used before you give an explanation for the action that you have just mentioned: [+ (that)] I deliberately didn't have lunch so (that) I would be hungry tonight. Leave the keys out so (that) I remember to take them with me.Connecting words which introduce a cause or reason so as to B2 in order to: I always keep fruit in the fridge so as to keep insects off it.Connecting words which introduce a cause or reason so as not to C1 in order not to: He did not switch on the light so as not to disturb her.
(Definition of so conjunctionadverb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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