logic
/ˈlɒdʒɪk/·로직·noun
reasoning conducted according to strict principles
GreekCEFR B1
Root
Greek 'logos' (word, reason) + -ic (relating to)
Greek logikē (the art of reasoning) → Latin logica → Old French logique → English logic
In a word
Greek logos = both 'word' and 'reason'. The work happening in the mind before a word leaves the mouth — that's logic. The same logos branches into dialogue (speech between two), biology (the discourse on life), psychology (on the soul). One Greek syllable holds up half of academia.
Examples
Her argument follows clear logic.
I see no logic in this decision.
Mathematicians study formal logic.
Related
dialoguemonologuebiologyprologueapology