What is the meaning of そう?

so, like that, in such a way, such

yes, yeah; it's like that; that's how it is; I see. (interjection to show that the speaker is paying attention)

seem, seem like, appear

apparently, heard that

: vibrant, manly, brave

: gross, general

: a male given name

: a surname

: Song

: race, run

添う, 副う: to accompany; to comply with

沿う: to follow; to run along

: be, do

Source: wiktionary.org