1. (noun) a part of a broadcast serial

• installment
• instalment

2. (noun) film consisting of a succession of related shots that develop a given subject in a movie

• sequence

1. (noun) a happening that is distinctive in a series of related events

• happening
• natural event
• occurrence
• occurrent

2. (noun) a brief section of a literary or dramatic work that forms part of a connected series

• section
• subdivision

3. (noun) a part of a broadcast serial

• broadcast
• program
• programme

4. (noun) film consisting of a succession of related shots that develop a given subject in a movie

• film
• photographic film

1. (noun) a happening that is distinctive in a series of related events

• chapter
• drama
• dramatic event
• idyll

2. (noun) a part of a broadcast serial

• cliffhanger