(clothing) An evening gown. / An event with a formal dress code. / (programming) A formal parameter. / (Oxbridge slang) Ellipsis of formal hall..

(uncountable) Formalin. / An acetal formed from formaldehyde.

(uncountable) The state of being formal. / Something said or done as a matter of form. / A customary ritual without new or unique meaning.

(programming) An abstract representation, typically including a name and a type, of a parameter expected to be passed to a method or function.

A solution of formaldehyde in water; used as a disinfectant and to preserve biological specimens.

at some time in the past / previously; once

Occurring, undertaken, or performed as a perfunctory matter, in the interest of form, or for the sake of formality. / Of or relating to a document of form, especially an invoice sent in advance.

Undertaken or performed as a perfunctory matter, in the interest of form, or for the sake of politeness.

A document that shows the standard entries of a form or similar document.

Alternative spelling of back-formation.