Full Idea
Logos can mean i) a thought or reasoning, ii) the word which expresses a thought, iii) a rational structure outside human thought. These meanings give 'logos' an extraordinary range.
Clarification
'Logos' is the broad Greek concept of human reasoning
Gist of Idea
'Logos' ranges from thought/reasoning, to words, to rational structures outside thought
Source
David Roochnik (The Tragedy of Reason [1990], Intro. 12)
Book Reference
Roochnik,David: 'The Tragedy of Reason: the Platonic logos' [Routledge 1990], p.12