元となった辞書の項目
バックグラウンド
noun
background (portion of an image or scene behind the main figure; portion less important than the figure) / one's personal background
意味（1）
background (portion of an image or scene behind the main figure; portion less important than the figure)
意味（2）
one's personal background
意味（3）
(computing) activity not normally visible to, or immediately relevant to a user
