A progression from a simple form to a more complex one: development, evolution, growth, progress, unfolding.

What does it mean to be Pitless?

adjective. Having no pit or pits; specifically (of a theatre) lacking an orchestra pit.

What is the difference between evolvement and evolution?

As nouns the difference between evolvement and evolution

is that evolvement is evolution (from simple to complex) while evolution is (general) gradual directional change especially one leading to a more advanced or complex form; growth; development.