Look at these examples:
You should clean the milk seen as you spilt it.
You should clean the milk seeing as you spilt it.
Which one is correct, and how is it grammatically defined/termed?
Seeing as is the generally accepted form; I don't recall ever hearing anyone say seen as (though it's possible I just didn't notice).
Grammatically speaking, seeing as is a conjunction; it fills the same function here as because. The Oxford English Dictionary defines it this way:
Its history goes at least as far back as 1504:
Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
Would you like to answer one of these unanswered questions instead?