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The Free On-line Dictionary of Computing (foldoc)

/konz/ or /kons/ [LISP, "construct"] A {Lisp} function which
takes an element H and a list T and returns a new list whose
head is H and whose tail is T.

In {Lisp}, "cons" is the most fundamental operation for
building structures. It actually takes any two objects and
returns a "{dotted-pair}" or two-branched tree with one object
hanging from each branch. Because the result of a cons is an
object, it can be used to build {binary trees} of any shape
and complexity.

[{Jargon File}]