1.NounA form (expression) that does not use limits, implicitly or explicitly.
"There is no known representation of π in closed form: each expression for it includes an integral, an infinite series, or an infinite continued fraction."
2.NounA differential form whose exterior derivative is zero.
3.NounA type of poetry with regular structure, such as meter or a rhyming pattern.
4.NounTrobar clus.
5.NounUsed other than figuratively or idiomatically: see closed, form.