noun
articulation; enunciation
Refers to the clarity of speech, often used in the phrase 呂律が回らない (slurred speech).
酔っ払って呂律が回らなくなった。
He got drunk and his speech became slurred.
緊張して呂律がうまく回らなかった。
I was so nervous I couldn't articulate properly.
発音 is the general term for pronunciation, while 呂律 specifically refers to the clarity and fluency of speech, often in the context of slurring or stumbling.
The kanji 呂 and 律 originally refer to musical pitch and rhythm, respectively. The compound 呂律 came to mean the rhythm and clarity of speech.