I think marriage is about two equal partners sharing a life together.
I thought tonight was about us hanging out, what's with inviting this girl?
Here, I'm wondering the function of "about". what's the meaning of "about" here?
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Sign up to join this communityThe preposition about has several meanings. One meaning is about + topic/subject. Collins Dictionary has it in no. 1: relating to, concerning, on the subject of. A bit more formal is on + topic.
http://www.collinsdictionary.com/dictionary/english/about
Curiously Oald does not have about + topic. http://www.oxfordlearnersdictionaries.com/definition/english/about_1