λεξικόν

Lexicon comes from Greek λεξικόν (lexikon), the neuter form of the adjective λεξικός (lexikos), meaning 'of or pertaining to words,' from λέξις (lexis, 'word, speech, diction'), from λέγειν (legein, 'to speak, to say, to pick out, to gather'). The lexikon was originally an adjective modifying an implied noun — λεξικόν βιβλίον (lexikon biblion) meant 'a word-book.' In usage, the noun dropped away and the adjective became the name for the thing: a lexikon was a dictionary or wordbook, particularly (in early usage) a Greek dictionary. The Greek legein has a fascinating dual sense: it means both 'to speak' and 'to gather, to collect, to pick.' A word, in Greek, is simultaneously something picked out from language and something said — selected from the available sounds and put to work. This double meaning is present in the word 'lexicon' from the start.

The distinction between a lexicon and a dictionary is partly conventional and partly meaningful. In English usage, 'dictionary' (from Latin dictio, a saying) tends to name comprehensive, authoritative, alphabetically organized reference works — the OED, Webster's, the Larousse. 'Lexicon' carries somewhat different associations: it is used for the vocabulary of a specialized domain ('the lexicon of computing,' 'the lexicon of jazz'), for the vocabulary of an ancient or classical language (a Greek lexicon, a Homeric lexicon), and in linguistics for the totality of words available in a language or stored in a speaker's mental vocabulary. A person's mental lexicon is not a book but a cognitive structure — the sum of all the words they know and can deploy, organized not alphabetically but by meaning, sound, usage context, and frequency.

The study of the lexicon is one of the oldest activities of scholars and one of the most revealing. Ancient grammarians catalogued words; medieval scholars organized them by etymology and theology; the great European dictionary projects of the nineteenth century — the OED in English, the Grimm brothers' Deutsches Wörterbuch in German, Littré's Dictionnaire in French — attempted the systematic recording of everything a language had ever said. Each word in a lexicon is a compressed history: the word 'window' records Viking settlement in England (from Old Norse vindauga, wind-eye); the word 'beef' records the Norman conquest (French boeuf replacing English cow in the mouths of Anglo-Norman lords); the word 'algebra' records the transmission of mathematics through Arabic scholarship. A lexicon is a cultural sediment.

The word 'illegal' is not in the Greek lexicon: the Greeks had no single concept that mapped onto the English word. The word 'hygge' is in the Danish lexicon but only approximately in the English one — English speakers recognize what it means but lack the word for it. These gaps and mismatches between lexicons tell you something real about the cultures that built them: what they named, what they cared about enough to give a precise word to, what they lumped together under one term and what they distinguished with many. The lexicon is not a neutral inventory. It is an argument, built one word at a time over centuries, about what in the world is worth naming.