Definition 2.5. A function is onto if each element of the codomain has at least one element of the domain assigned to it. In other words, a function is onto if the range equals the codomain.

I seemed to look down on a parterre of mixed hyacinths, variegated tulips, and dark-hearted poppies, as I beheld them.

Amongst these stations is the well-known place called Qatya, where zakat is collected from the merchants, their goods are examined and their baggage most rigorously searched.

In less time than it takes to fry a burger, a competent crepier can cook a thin, eggy pancake, flip it, fill it, fold it and present it ready to eat.