The dime, in United States usage, is a ten-cent coin (10¢), one tenth of a United States dollar, labeled formally as "one dime". The denomination was first authorised by the Coinage Act of 1792. The dime is the smallest in diameter and is the thinnest of all U.S. coins currently minted for circulation, being 0.705 inches (17.91 millimeters) in diameter and 0.053 in (1.35 mm) in thickness. The obverse of the current dime depicts the profile of President Franklin D. Roosevelt and the reverse shows an olive branch, a torch, and an oak branch, from left to right respectively.
The word dime comes from the Old French disme (now dîme), meaning "tithe" or "tenth part", from the Latin decima [pars]. In the past prices have occasionally been quoted on signage and other materials in terms of dimes, abbreviated as "d" or a lowercase "d" with a slash through it (đ) as with the cent and mill signs. After the half dime became five cents in 1873, the dime is now the only United States coin in general circulation that is not denominated in terms of dollars or cents.
Listed below are patterns and trials which were considered and produced for trial, but were never released into circulation.