Not following a regular rhythm or pattern; occurring outside of normal rhythmic sequences.
From Latin 'extra' (outside) + 'rhythmical' (from Greek 'rhythmos' meaning measured flow or beat). This technical term describes anything that breaks expected temporal patterns.
In music and medicine, rhythmic patterns are so important that when something is 'extrarhythmical'—like an irregular heartbeat or an off-beat musical phrase—it immediately stands out as unusual and worth investigating.
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