(usually in the plural) A leading or primary principle, rule, law, or article, which serves as the groundwork of a system; an essential part / (physics) The lowest frequency of a periodic waveform.

Pertaining to the foundation or basis; serving for the foundation. / Essential, as an element, principle, or law; important; original; elementary.

(finance) Any unregistered investment fund, often characterised by unconventional strategies (i.e., strategies other than investing long only in bonds, equities or money markets).

(computing theory) A function from (state, input symbol) to state describing what state to move to on receiving a given input in a given state.

(slang, vulgar) To fritter aimlessly or distractedly, to procrastinate, to waste time. / (slang, vulgar) To fool around. / (slang, vulgar) To have sex with many partners.

(physics) Any of the fundamental forces that act between elementary particles; each one is associated with an exchanged particle.

(Canada, US, slang, vulgar) anal sex

(Canada, US, slang, vulgar) Engaging in anal sex

(religion) The tendency to reduce a religion to its most fundamental tenets, based on strict interpretation of core texts. / (by extension) A rigid conformity to any set of basic tenets.

A prediction that, by being voiced, causes itself to come true.