System of
succession in a
monarchy where
females can be
heirs to the
throne only if there is no
male offspring to the
current monarch (
regardless of age and who was born first). If females can be heirs only when the current monarch has no (
applicable) male
relatives at all it's called
agnatic-cognatic succession (used in
the Netherlands,
for example). When the
firstborn child is
heir apparent regardless of
gender it's called
cognatic succession, this is the
case in for example
Sweden.
Agnatic succession is used in for example England and Denmark (which both currently have Queens for monarchs, ironically enough).