Energy derived from any source other than fossil fuels. / Energy derived from any renewable source, i.e other than fossil fuels or nuclear fission.

A voting system in which each voter lists the candidates in order of preference. At each stage the candidate with the fewest votes is excluded and their votes transferred according to the voters' preferences.

(physics) An electric current in which the direction of flow of the electrons reverses periodically.

Any of various medical methods and practices used in place of, or as well as, conventional medicine.

(geometry) the internal angles made by two (parallel) lines with a third, on opposite sides of it.

(mathematics) Any function in which the interchange of two independent variables changes the sign of the dependent variable.

Any lifestyle generally perceived to be outside the norm of its culture. / (euphemistic, dated) Homosexuality, or other LGB identity or behavior.

A kind of indie country music meshing traditional forms of country music with diverse musical styles like folk, pop, punk and heavy metal.

Counterfactual history, a form of scientific speculation used by historians.

plural of alternative medicine