20-letter words containing a, s, y, t, o, l
- subscription library — a commercial lending library
- surveillance society — a society where surveillance technology is widely used to monitor people's everyday activities
- system international — Système International d'Unités
- systemic circulation — the circulatory system in general.
- the whole nine yards — everything that is required; the whole thing
- theosophical society — a society founded by Madame Blavatsky and others, in New York in 1875, advocating a worldwide eclectic religion based largely on Brahmanic and Buddhistic teachings.
- three-dimensionality — having, or seeming to have, the dimension of depth as well as width and height.
- treaty of versailles — the treaty of 1919 imposed upon Germany by the Allies (except for the US and the Soviet Union): the most important of the five peace treaties that concluded World War I
- upper yosemite falls — a section of Yosemite Falls in central California, in the Yosemite National Park that is 436 m (1430 ft) high
- voluntary euthanasia — the act of killing someone painlessly, esp to relieve suffering from an incurable illness, with their consent
- whyte classification — a system for classifying steam locomotives according to the total number of wheels on the front trucks, drivers, and rear trucks, in that order. For example, a Pacific locomotive is designated as 4-6-2.
- winter olympic games — an international contest of winter sports, esp skiing, held every four years
- yellow-breasted chat — an American warbler, Icteria virens, having a yellow throat and breast and greenish-brown upper parts and noted for imitating the songs of other species.