WWordGenerator.org GeneratorsWord ListsBlogAboutGenerate a word Home / I / index number index number noun 3 syllables 12 letters Scrabble 23 WWF 28 Definitions noun a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time indexindicantindicator Look “index number” up elsewhere Wiktionary ↗ Merriam-Webster ↗ Etymonline ↗ Dictionary.com ↗ Want another word?Spin the dictionary for a fresh one. Generate a word →