What does 课 (kè) mean in English?

Card 60HSK 2010 Level 260/146
CARD60
PROGRESS41%
subject; course; class; lesson; CL:堂[tang2],节|節[jie2],門|门[men2]

Reveal: Click/Space/Enter/↑↓/w/s/j/kNavigate: ←→/h/l/a/d