The derivation
λόγος is the largest word in this collection and the one whose etymology travels furthest from its origin. The authorities do not disagree about that origin; they agree completely, and the agreement is the finding. λόγος is the action-noun of the verb λέγω, and λέγω does not begin by meaning to speak. Beekes gives the three stages in order: "to collect, gather" (the Homeric sense), then "to count, recount," and only "say" — post-Homeric (Beekes, EDG s.v. λέγω). Frisk lays out the identical sequence: "auflesen, sammeln," to pick up and gather, then "zählen, auf-, erzählen," to count and recount, and finally, after Homer, "reden, sprechen," to speak (Frisk, GEW s.v. λέγω). The word for speech and reason is built on a verb for gathering things up.
The root is *leg- "to collect," and its primary cognate settles the matter. Frisk calls λέγω "uridentisch" — primordially identical — with Latin legō "to pick up, to read"; Beekes states it the same way, "identical with Lat. lego 'to collect'," adding Albanian mb-ledh "to collect, harvest" (Beekes and Frisk, s.v. λέγω). Latin legō is the verb behind collect, select, lecture, and legible — and behind it and λέγω alike stands the act of picking up and gathering. Beekes notes one loose thread: a synonymous root *les- (German lesen "to read," Gothic lisan "to harvest") covers the same ground, "but the relation between *les- and *leg- is unclear."
From that root the noun climbs. Chantraine charts the ascent: λόγος runs through "récit, compte, considération, explication, raisonnement, raison, parole" — narrative, account, consideration, explanation, reasoning, reason, speech — and stands, characteristically, for word as opposed to deed, λόγος against ἔργον. Then it keeps rising: "le mot a fini par désigner la raison immanente," the word came to name immanent reason itself, and in Christian theology "soit la seconde personne de la Trinité, soit Dieu" — the second person of the Trinity, or God (Chantraine, DELG s.v. λέγω). The verb of picking up grain became the name for the rational order of the cosmos.
Root
- *leg- "to collect, gather" — accepted by all three, no dissent. Latin legō "pick up, read" is, in Frisk's word, "uridentisch" with λέγω; Albanian mb-ledh "gather, harvest" (palatal *ǵ). Pokorny 858.
- One uncertainty (Beekes): a synonymous root *les- (German lesen, Gothic lisan "harvest," Hittite les-) overlaps in sense, "but the relation between *les- and *leg- is unclear." It does not unseat *leg-.
- The semantic chain is internal to Greek: gather → count / recount → speak (post-Homeric) → account, reason.
In the corpus
8,336 occurrences — λόγος is, by a wide margin, the largest word in the entire corpus. No other soul-term comes close; the count alone marks it as the master-word of Greek thought. Its derivatives populate the whole vocabulary of mind: λογικός "logical," λογισμός "reasoning," λογίζομαι "to reckon," ἄλογος "without speech or reason, irrational," ἀνάλογος "proportional," φιλόλογος the lover of λόγος. The first attestations are already weighty — Homer's λόγοι at Iliad 15.393 and Odyssey 1.56 — and the line runs unbroken to λόγιον, the "oracle" that in the Septuagint and the Gospels becomes the sacred utterance, the words of Jesus. The word that began in the threshing-floor ends in scripture.
The word's world
λόγος is where speech became reason and reason became cosmic. Richard Seaford catches the etymological thread still showing in the philosophical word: λόγος "shares with its verb legein the sense… of an account that is precise and complete" (Seaford, Money and the Early Greek Mind) — the gathering never quite leaves it; to give a λόγος is still to collect the matter into a complete reckoning. With Heraclitus the leap is made: Shirley Darcus Sullivan shows how he "imbues the term logos, which his listeners would readily assume meant 'speech', with a more profound and universal significance" — the λόγος as "the divine principle guiding 'all things,'" existing apart from them yet "found as a capacity in human beings" (Sullivan, Psychological and Ethical Ideas). Etymology and philosophy say one thing together: to speak truly is to gather the world into an account, and the order so gathered is the same λόγος that orders the world. The collection that named this project is, at root, a gathering.
Authorities: Beekes, Etymological Dictionary of Greek (Brill 2010) s.v. λέγω (scan pp. 888–889, #3697; λόγος recorded as DER 1; the standalone #3792 is a cross-reference stub); Chantraine, Dictionnaire étymologique de la langue grecque s.v. λέγω (scan pp. 642–643, #4735 + #4736); Frisk, Griechisches etymologisches Wörterbuch s.v. λέγω (scan pp. 1066–1068, #3519; the homograph λόγος "woodpecker" at #3078 is unrelated). Root *leg- and Latin legō per all three; Pokorny 858. Interpretive sources retrieved from the Oracle library (Classical Philology & Ancient Thought): Sullivan, Psychological and Ethical Ideas (1995); Seaford, Money and the Early Greek Mind (2004); cf. Edinger, The Psyche in Antiquity (1999). Scholarly anchors named by the dictionaries: Fournier, Les verbes "dire" en grec (1946); Boeder, Archiv für Begriffsgeschichte 4 (1959). Corpus figures: Logoi corpus, live. Receipt: soul-word-journey-v0.