means A person who watches an event, game, or activity without taking part in it.

from Straight from Latin spectare, "to watch or look at" (a frequentative of specere, "to see"), which gave Roman amphitheatres their spectators — and English a whole family of cousins like spectacle, spectacles, inspect, and spectre. The word arrived in English in the 16th century, perfectly fitted for anyone seated and staring.