noun

• Various concepts of development or evolution popularised by Charles Darwin's publication of On the Origin of Species in 1859.
• The principles of natural selection set out in Charles Darwin's On the Origin of Species (1859), more strictly defined by August Weismann and developed by other authors into a central part of the modern evolutionary synthesis.
• Alternative letter-case form of Darwinism. [Various concepts of development or evolution popularised by Charles Darwin's publication of On the Origin of Species in 1859.]