Undefined

If you divide any number by zero, the result is undefined.

An irregular galaxy has an undefined shape and is full of young stars, dust, and gas.

Now remember, our variable is still undefined.

The result of dividing any number by zero is undefined.

The countries have competing claims to villages and towns along the porous, undefined border.

We slid into our office, past two women discussing the "X factor," an apparently undefined quality their firm felt they lacked.

The result of division by zero is undefined.

[Option:] · [PDP11:] F [BSD:] · [XE 2.3:] [1] [XE 3.0:] · [SIII:] · [COFF:] · [meaning:] make undefineds global

Every operation is defined completely either by delivering a value of some type depending only on the types of its operands or by causing some defined exception; there are no ‘undefineds’ in Ten15.

The Array object has these commonly-used properties: • .length: the number of items including undefineds.