21-letter words containing g, i, o, c, n
- topological invariant — a property of a topological space that is a property of every space related to the given space by a homeomorphism.
- trades union congress — The Trades Union Congress in Britain is the same as the TUC.
- what price something? — what are the chances of something happening now?
- youth training scheme — (formerly, in Britain) a scheme, run by the Training Agency, to provide vocational training for unemployed 16–17-year-olds