maintheme
nounUK /ˈmeɪn θiːm/
US /ˈmeɪn θiːm/
The main theme is the big idea that a story or song is mostly about.
The main theme of the book is friendship.
OTHER MEANINGS
2. The main melody in a piece of music.
The orchestra played the main theme before the hero appeared.
3. The most important decoration or style in a room or party.
The party's main theme was outer space.
4. The central subject of a discussion or essay.
The main theme of the meeting was saving water.