noun
tonal meter (in Chinese poetry); consistency
Primarily a technical term for the tonal pattern of Chinese poetry. The extended meaning 'consistency' or 'logical coherence' is rare and mostly found in the set phrase 平仄が合う (to be consistent).
漢詩では平仄が非常に重要です。
In Chinese poetry, tonal meter is extremely important.
彼の説明は平仄が合わない。
His explanation doesn't add up.