The state or quality of being fully developed or mature in size and physical capabilities.
Compound of 'full-grown' (completely developed) and the suffix '-ness' (which creates nouns describing states or qualities), a formation that became more common in modern English.
The concept of 'full-grownness' is surprisingly cultural—what counts as 'fully grown' changes across societies and history, from physical maturity to when someone could legally marry or own property.
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