23-letter words containing a, n, t, i, f, o
- tongass national forest — a temperate rainforest in SE Alaska that also harbors more than two dozen communities, including Juneau: largest US national forest. 17 million acres (69,000 km).
- transcendental function — a function that is not an algebraic function.
- unipress software, inc. — (company) A developer and distributor of Unix software. They produce PC-UNIX connectivity software, development tools and applications and provide technical support and maintenance, porting services, training and consulting.
- united church of canada — the largest Protestant denomination in Canada, formed in the 1920s by incorporating some Presbyterians and most Methodists
- united states air force — the permanent or regular military air force of the United States, established in 1947 as a separate service under the authority of the Department of Defense: a branch of the U.S. Army before 1947. Abbreviation: USAF.
- united states of brazil — former official name of Brazil.
- university of minnesota — (body, education) The home of Gopher. Address: Minneapolis, Minnesota, USA.
- urinary tract infection — infection of any part of the urinary tract, especially the urethra or bladder, usually caused by a bacterium, Escherichia coli, and often precipitated by increased sexual activity, vaginitis, enlargement of the prostate, or stress. Abbreviation: UTI.
- velocity of circulation — the frequency with which a single unit of currency or the total money supply turns over within the economy in a given year.
- weak inter-action force — a force between elementary particles that causes certain processes that take place with low probability, as radioactive beta-decay and collisions between neutrinos and other particles.
- wordperfect corporation — (company) The original developers of the WordPerfect word processor and a variety of other applications for personal computers. WordPerfect was founded in Provo, Utah, USA in 1979 by Alan Ashton and Bruce Bastion as "Satellite Software International". The company name was changed to Wordperfect Corporation in 1986. The company was bought by Novell, Inc. in 1994, who then sold it to Corel Corporation in 1996.