Greek:
- Logos: Word, speech, reason, discourse.
- Logikos: Rational, logical, pertaining to reason or language.
- Logion: A saying, maxim, or oracle.
- Logismos: Thought, reasoning, calculation.
- Logothete: A high-ranking official in the Byzantine Empire responsible for the imperial chancellery and diplomacy.
Latin:
- Logica: Logic, the study of reasoning and argumentation.
- Logica utens: Using logic, employing logical reasoning.
- Logomachi: Verbal dispute or argument, quarrel about words.
- Logographus: A writer of speeches, a speechwriter.
- Logos: Word, thought, expression, reason.