Hundred is the cardinal number equivalent to ten times ten, or 100. There are several synonyms for the word hundred. One synonym is "century," which refers to a period of 100 years. Another synonym is "centesimal," which is used to describe a ratio or percentage equivalent to one hundred parts out of one hundred. "C-note" is a casual term used in American English to refer to a 100-dollar bill. "Hundredweight" is a unit of measurement used in British and American systems that refers to 100 pounds. Lastly, "hectad" is a rarely used word that refers to a group or set of 100 things or individuals.