1. Every hundred years; once in a century
   "the birthday of this city is being celebrated centennially"

See also: centennial

• soh
• Soho
• soi-disant
• soigné
• soignée
• soil
• soil bank
• soil conditioner
• soil conservation
• soil erosion
• soil horizon
• soil pipe
• soil profile
• soil science
• soil-building
• soiled
• soiling
• soilure
• soiree musicale
• soirée
• Soissons
• soixante-neuf
• soja
• soja bean
• sojourn