25-letter words containing a, e, c, i, d, l
- transcendental meditation — a technique, based on ancient Hindu writings, by which one seeks to achieve a relaxed state through regular periods of meditation during which a mantra is repeated. Abbreviation: TM.
- transcendental-philosophy — transcendental character, thought, or language.
- unconditional convergence — the property of a convergent infinite series that remains convergent when the terms are arranged in any order.
- undisputed world champion — a boxer who holds the World Boxing Association, the World Boxing Council, the World Boxing Organization, and the International Boxing Federation world championship titles simultaneously
- vertical redundancy check — (storage, communications) (VRC) An error checking method performed on one 8-bit ASCII character, where the 8th bit is used as the parity bit. The resulting parity bit is constructed by XORing the word. The result is a "1" if there is an odd number of 1s, and a "0" if there is an even number of 1s in the word. This method is unreliable because if an odd number of bits are distorted, the check will not detect the error. The Longitudinal Redundancy Check is an improvement.
- war of the grand alliance — the war (1689–97) in which England, the Netherlands, Spain, Sweden, and the Holy Roman Empire in league with Bavaria, Brandenburg, Savoy, and the Palatinate opposed France.