User:Allixpeeke/math

Numeral prefixes.

megabytes, kilobytes, etc.

first, second, third

primary, secondary, tertiary, …, quinquennary

quartet, quintet

quintuplets, sextuplets

once, twice, thrice

trifecta

Years

 * 1) year
 * 2) decade
 * 3) century
 * 4) millennium
 * 5) billennium
 * 6) trillennium