(mathematics) The quantile dependence between two time series

plural of volt-ampere

(mineralogy) An orthorhombic-dipyramidal mineral containing aluminum, hydrogen, iron, magnesium, manganese, nickel, oxygen, silicon, and sodium.

(UK) The wren, Troglodytes troglodytes, especially as considered (in nursery-rhymes, etc.) as the wife or sweetheart of robin redbreast.