Definition of "So" :
noun: the syllable naming the fifth (dominant) note of any musical scale in solmization
adverb: in truth (often tends to intensify)
"He did so do it!."
adverb: (used to introduce a logical conclusion) from that fact or reason or as a result
"The witness is biased and so cannot be trusted."
adverb: subsequently or soon afterward (often used as sentence connectors)
"And so home and to bed."
adverb: in a manner that facilitates
"He observed the snakes so he could describe their behavior."
adverb: in the way indicated
"Hold the brush so."
adverb: to a very great extent or degree
"The idea is so obvious."
adverb: (usually followed by that') to an extent or degree as expressed
"He was so tired he could hardly stand."
adverb: in such a condition or manner, especially as expressed or implied
"They're happy and I hope they will remain so."
adverb: to a certain unspecified extent or degree
"I can only go so far with this student."
adverb: in the same way; also
"I was offended and so was he."