# Evolve
## Overview
**Evolve** means to develop or change gradually over time. In biology, it specifically describes the process by which populations of organisms change across generations through variation and natural selection. The word's Latin origin — 'to unroll' — carries an interesting tension with its modern scientific meaning.
## Etymology
The verb entered English in the 1640s from Latin *evolvere* ('to unroll, unfold, open out'), a compound of *ex-* ('out') and *volvere* ('to roll, turn'). The original English use was literal: to unroll a manuscript or scroll, revealing its contents. The figurative sense of gradual unfolding or development appeared in the 18th century.
## The Volvere Family
Latin *volvere* ('to roll') descends from PIE **\*welH-** ('to turn, roll') and has generated an extensive English vocabulary:
- **Revolve**: *re-* + *volvere* — to roll back, turn around - **Involve**: *in-* + *volvere* — to roll into, entangle - **Volume**: from *volumen* ('a roll, scroll') — originally a rolled manuscript - **Revolt**: through French from Italian *rivoltare* — to turn back, overturn - **Vault**: through French *volte* — a turn, an arched turning - **Voluble**: from *volubilis* — easily rolling, hence fluent in speech - **Vulva**: possibly from *volvere* — 'wrapper, covering'
The Germanic branch produced English **waltz** (through German *Walzer*, 'a turning dance'), **walk** (Old English *wealcan*, originally 'to roll, toss'), **wallow** ('to roll about'), and **welter** ('to roll, tumble').
## Darwin and Evolution
The biological application of **evolution** has a complex history. The word was not Darwin's first choice. In *On the Origin of Species* (1859), he preferred the phrase 'descent with modification' and used 'evolved' only once — as the famous final word of the book.
Darwin's hesitation was etymologically sound. *Evolve* literally means 'to unroll' — as if the final form were already present in the scroll, merely waiting to be revealed. This implies predetermination, which contradicts natural selection's core mechanism of random variation and environmental filtering. The earlier theory of 'preformation' in embryology — which held that a miniature organism was pre-formed in the egg or sperm and merely unfolded during development — fit the etymology perfectly. Darwin's theory did not.
Herbert Spencer popularized 'evolution' in its biological sense, coining the phrase 'survival of the fittest' in 1864. His broader philosophical project applied evolutionary thinking to society, ethics, and the cosmos. Despite the etymological mismatch, 'evolution' became the standard term through Spencer's influence and its adoption by T.H. Huxley and other Darwin advocates.
## Modern Usage
Today **evolve** functions in both technical and everyday registers. Biologists use it precisely: species evolve through genetic variation, natural selection, genetic drift, and gene flow. In common speech, it means any gradual development: 'the plan evolved,' 'her thinking evolved,' 'the technology evolved.' The everyday usage often carries an implication of improvement that the biological sense emphatically does not — evolution has no direction or goal.
## Related Forms
The family includes **evolution** (noun), **evolutionary** (adjective), **evolutionist** (one who studies or advocates evolution), and the rarer **evolvable** (capable of evolving). **Devolution** (de- + evolution) means transfer of power downward or regression.