English

logic

Logic comes from Middle English logik, from Old French logike, from Latin logica, from Greek λογική ‘logic’, from λόγος ‘speech, reason’.

Proto-Indo-Europeanc. 4500–2500 BCE*leǵ-¹‘to collect, gather (words)’reconstructed
Proto-Hellenicc. 2200–1600 BCE*lógos¹reconstructed
Ancient Greekc. 800–300 BCEλόγος²‘speech, reason’
Ancient Greekc. 800–300 BCEλογικός³logĭkós‘of speech or reason; rational’
Ancient Greekc. 800–300 BCEλογική³‘logic’
Latinc. 75 BCE–200 CElogica³
Old Frenchc. 842–1400logike³
Middle Englishc. 1150–1500logik³
Englishtodaylogic³

attested reconstructed ? uncertain or disputed deepest recorded ancestor

Lineage

Proto-Indo-Europeanc. 4500–2500 BCE*leǵ-1Wiktionary, Ancient Greek λόγος‘to collect, gather (words)’reconstructed
Proto-Hellenicc. 2200–1600 BCE*lógos1Wiktionary, Ancient Greek λόγοςreconstructed
Ancient Greekc. 800–300 BCEλόγος2Wiktionary, Ancient Greek λογικός‘speech, reason’
Ancient Greekc. 800–300 BCEλογικός3Wiktionary, English logiclogĭkós‘of speech or reason; rational’
Ancient Greekc. 800–300 BCEλογική3Wiktionary, English logic‘logic’
Latinc. 75 BCE–200 CElogica3Wiktionary, English logic
Old Frenchc. 842–1400logike3Wiktionary, English logic
Middle Englishc. 1150–1500logik3Wiktionary, English logic
Englishtodaylogic3Wiktionary, English logic

English words that share an ancestor with logic, grouped by the ancestor they share, most familiar first.

408 more relatives in the full family tree

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Proto-Indo-Europeanc. 4500–2500 BCE*leǵ-‘to collect (words)’reconstructed
Proto-Hellenicc. 2200–1600 BCE*lógosreconstructed
Ancient Greekc. 800–300 BCEλόγοςlógos‘speech, reason’
Ancient Greekc. 800–300 BCEλογικόςlogikós‘of or pertaining to speech or reason or reasoning, rational, reasonable’
Ancient Greekc. 800–300 BCEλογικήlogikḗfeminine of λογικός
Latinc. 75 BCE–200 CElogica
Old Frenchc. 842–1400logike
Middle Englishc. 1150–1500logik
Englishtodaylogic

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adj Logical.

Sources: Wiktionary, “logic”; the older steps come from the Wiktionary entries for Ancient Greek λόγος, Ancient Greek λογικός. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.