subject matter
US /ˈsʌbdʒekt ˌmætər/
UK /ˈsʌbdʒekt ˌmætər/

1.
materi pokok, subjek
the topic or theme of a book, discussion, or work of art
:
•
The subject matter of the painting was a landscape.
Materi pokok lukisan itu adalah pemandangan.
•
The professor's lecture covered a wide range of subject matter.
Kuliah profesor mencakup berbagai materi pelajaran.