(Cambridge University slang) A social meal between two university societies (a swap) held at a formal hall; generally less associated with drinking games and rowdy behaviour.

plural of formal swap

plural of formal charge

(chemistry) The charge assigned to an atom in a molecule, assuming that electrons in all chemical bonds are shared equally between atoms, regardless of relative electronegativity.

(mathematics, algebra) Any finite or infinite series of the form a_0+a_1x+a_2x²…=∑ᵢa_ixⁱ, where the aᵢ are numbers, but it is understood that no value is assigned to x.