So

1. True, accurate.

   That is so.  You are responsible for this, is that not so?

2. In that state or manner; with that attribute. A proadjective that replaces the aforementioned adjective phrase.
3. Homosexual.

   Is he so?

1. To the (explicitly stated) extent that.

   It was so hot outside that all the plants died.  He was so good, they hired him on the spot.

2. To the (implied) extent.

   I need a piece of cloth so long. [= this long]

3. In a particular manner.

   Place the napkin on the table just so. If that's what you mean, then say so; (or do so).

4. In the same manner or to the same extent as aforementioned; also.

   Just as you have the right to your free speech, so I have the right to mine.  Many people say she's the world's greatest athlete, but I don't think so.  "I can count backwards from one hundred." "So can I."

5. With as To such an extent or degree; as.

   so far as;  so long as;  so much as

1. In order that.

   Eat your broccoli so you can have dessert.

2. With the result that; for that reason; therefore.

   He ate too much cake, so he fell ill.

3. Provided that; on condition that, as long as.

1. Used after a pause for thought to introduce a new topic, question or story.

   So, let's go home.

2. Short for so what.

   "You park your car in front of my house every morning." — "So?"

3. Used to connect previous conversation or events to the following question.

   So how does this story end?

4. Used to introduce a rhetorical question.

   We'd like to visit but I don't know if we can afford a hotel. —So who's staying in a hotel? Stay with us.

5. Be as you are; stand still; used especially to cows; also used by sailors.

1. Some person.

   Can someone help me, please?

noun

A syllable used in solfège to represent the fifth note of a major scale.

noun

(foods) A type of dairy product, made especially in Japan between the seventh and 10th centuries, by reducing milk by boiling it.