Spectator (noun)

1. A person who watches or observes something, especially an event or a performance.
2. A person who is present at an event or performance but not taking part in it.

Origin:

Late 16th century: from latin spectator, from spectare "look at".

Examples:

1. The spectators at the soccer game cheered loudly for their team.
2. The spectators were amazed by the acrobat's performance.
3. The film festival attracted a large number of spectators.
4. She was a passive spectator of the scene before her.
5. The spectators gathered to witness the opening ceremony of the Olympic Games.