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English definition of “so”

so

conjunction, adverb     /səʊ/ US  /soʊ/
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. Grammar:SoGrammar:So + adjective (so difficult), so + adverb (so slowly)We often use so when we mean ‘to such a great extent’. With this meaning, so is a degree adverb that modifies adjectives and other adverbs:Grammar:So much and so manyWe use so before much, many, little and few:Grammar:So as a substitute formGrammar:So am I, so do I, Neither do IWe use so with be and with modal and auxiliary verbs to mean ‘in the same way’, ‘as well’ or ‘too’. We use it in order to avoid repeating a verb, especially in short responses with pronoun subjects. When we use so in this way, we invert the verb and subject, and we do not repeat the main verb (so + verb [= v] + subject [= s]):Grammar:So as a conjunctionWe use so as a subordinating conjunction to introduce clauses of result or decision:Grammar:So as a discourse markerGrammar:So: other uses in speakingSo far means ‘up to now’:Grammar:So that or in order that?We use so that and in order that to talk about purpose. We often use them with modal verbs (can, would, will, etc.). So that is far more common than in order that, and in order that is more formal:
(Definition of so conjunctionadverb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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