meaning of back to december by taylor swift
it means a remorseful plea for forgiveness for breaking up with a former lover
Back to December
According to Swift, "Back to December" is the first time she ever apologizes to someone in a song. Critics speculate that the song is about Taylor Lautner, Swift's ex-boyfriend, which was later acknowledged by Lautner. "Back to December" is considered an orchestral country pop ballad and its lyrics are a remorseful plea for forgiveness for breaking up with a former lover.

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Back to December [SEP] Introduction
"Back to December" received acclaim reviews from critics, who regarded it as one of the highlights of "Speak Now". Critics have praised the song for its lyrics, melody, and vocals. The song enjoyed commercial success, peaking at number six on the "Billboard" Hot 100 in the United States, and at number seven in Canada. It also peaked at number three on the "Billboard" Hot Country Songs chart. The song received moderate success internationally, peaking at number 24 in New Zealand, and number 26 in Australia. The song's accompanying music video, directed by Yoann Lemoine, laments the aftermath of a break-up between Swift and her boyfriend.