Origins
The Latin word 'lēx' — meaning 'law, statute, regulation' — is the foundation of the legal vocabulary of English and every other language in the Western legal tradition. But its influence extends far beyond the courtroom: through the related verb legere ('to read, to choose, to gather'), it connects the law to reading, intelligence, elegance, and religion.
The etymology of lēx is debated but most likely traces to the Proto-Indo-European root *leǵ-, meaning 'to collect' or 'to gather.' The semantic development would have run from 'a collection (of rules)' to 'a body of regulations' to 'a law.' This same root produced Latin legere, which meant 'to gather' (as in collecting fruit or shells), 'to choose' (selecting from what is gathered), and 'to read' (gathering meaning from written characters). Greek λέγω (légō, 'to say, to count, to gather') is a cognate, as is λόγος (lógos, 'word, reason, account').
In Roman law, lēx had a specific technical meaning: a written statute proposed by a magistrate and approved by a popular assembly. This distinguished it from iūs (the broader concept of law, right, and justice) and from mōs (custom). The Twelve Tables (Lex Duodecim Tabularum), Rome's first written code, were leges in this sense. The word was also used for private contracts and agreements: a 'lex contractūs' was the law of the contract, the terms agreed upon.
Latin Roots
The direct derivatives of lēx in English form the core vocabulary of law. 'Legal' (from Latin lēgālis, 'of the law') arrived in the fifteenth century. 'Legislate' is a nineteenth-century back-formation from 'legislation' (from Latin lēgislātiō, from lēx + lātiō, 'a proposing,' from ferre, 'to carry' — legislation is literally 'law-carrying,' the proposing of laws). 'Legislature' and 'legislator' follow the same formation. 'Legitimate' (from Latin lēgitimus, 'lawful, according to law') originally meant 'born in lawful wedlock' before broadening to mean 'genuine, proper.'
The doublets 'legal' and 'loyal' beautifully illustrate the divergence of learned and popular borrowings. Latin lēgālis entered English twice: directly from Latin as 'legal' (with the g preserved) and through Old French as 'loyal' (where the g was vocalized and lost in Vulgar Latin). A loyal person was originally a lawful person — one who kept faith with their obligations. 'Loyalty' preserves this original sense.
'Privilege' comes from Latin prīvilēgium (prīvus, 'private' + lēx, 'law'), meaning 'a law applying to a single person' — a private exemption from the general rule. The word's modern political connotations of unearned advantage descend directly from this Roman legal concept. 'Sacrilege' comes from sacrilegium (sacer, 'sacred' + legere, 'to gather, to steal'), meaning 'the theft of sacred objects.'
French Influence
The verb legere ('to read, to gather, to choose') generated an even larger family in English, though the connection to lēx is often invisible. 'Lesson' comes from Old French leçon, from Latin lēctiō ('a reading'), from legere. 'Lecture' has the same origin. 'Legend' comes from Medieval Latin lēgenda ('things to be read'), the gerundive of legere — legends were originally texts prescribed for reading aloud in monasteries. 'Legible' means 'able to be read.'
The compounds of legere are among the most common words in English. 'Collect' (com- + legere, 'to gather together'), 'elect' (ē- + legere, 'to choose out'), 'select' (sē- + legere, 'to choose apart'), 'neglect' (nec- + legere, 'not to pick up'), and 'intellect' (inter- + legere, 'to choose between, to discern') all descend from legere. 'Intelligent' means 'able to discern between things.' 'Diligent' comes from dīligere (dis- + legere, 'to single out, to value highly, to love'), and its original sense was 'loving, attentive.' 'Elegant' comes from ēlegāns (ē- + legere, 'choosing out'), meaning 'fastidious, tasteful' — one who elegantly selects.
'College' comes from Latin collēgium (com- + legere, 'chosen together'), originally a body of persons united by common purpose — a guild, a board, a priestly brotherhood. 'Colleague' is from the same root: one chosen alongside you.
Modern Legacy
The intertwining of lēx ('law') and legere ('to read') in Latin reflects a deep cultural truth: in Rome, law was fundamentally a written and read phenomenon. Laws were inscribed on bronze tablets, read aloud in assemblies, and collected into codes. The act of reading and the authority of law were inseparable. This connection persists in modern legal culture, where the law remains a body of texts to be read, interpreted, and applied — and where 'legal literacy' is a prerequisite for citizenship.