21-letter words containing c, h, y, m
- reinforcement therapy — a behavior modification technique in which appropriate behavior is strengthened through systematic reinforcement.
- sympathetic vibration — a vibration induced by resonance.
- synchronized swimming — a sport growing out of water ballet in which swimmers, in solo, duet, and team efforts, complete various required figures by performing motions in relatively stationary positions, along with a freestyle competition, with the contestants synchronizing movements to music and being judged for body position, control, and the degree of difficulty of the moves.
- the maastricht treaty — a treaty on European economic and monetary union agreed by government leaders of the 12 EC states at a meeting in Maastricht in December 1991
- the student community — the body of students in further and higher education, considered as a whole
- therapeutic community — a group-based form of therapy for mental disorders, sometimes residential
- youth training scheme — (formerly, in Britain) a scheme, run by the Training Agency, to provide vocational training for unemployed 16–17-year-olds