just

The word 'just' entered English in the late 14th century via Old French 'juste', meaning righteous or equitable. It originates from the Latin adjective 'iustus', which itself is derived from the noun 'ius', meaning law or right. The core concept of 'ius' in ancient Roman society encompassed both formal legal right and moral fairness. This dual sense of conformity to both legal statute and ethical principle traveled through French into English, where it broadened further to encompass the adverbial senses of precision ('exactly') and limitation ('only'), all connected by the underlying idea of being precisely right or fitting.

The word 'just' is a simplex word derived from a single Latin root. It does not contain separable, meaningful morphemes in its modern English spelling.