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Related to P-R interval: P-R segment, PQ interval

INTERVAL. A space of time between two periods. When a person is unable to perform an act at any two given periods, but in the interval he has performed such act, as when a man is found to be insane in the months of January and March, and he enters into a contract or makes a will in the interval, in February, he will be presumed to have been insane at that time; and the onus will lie to show his sanity, on the person who affirms such act. See Lucid interval.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
[9] In our study, we found that ECG variables like P-R interval and QRS duration were linearly correlated with body mass index and it was statistically significant.
Bundle branch block with short P-R interval in healthy young people prone to paroxysmal tachycardia.
A 24-hour ambulatory ECG recorded during the same admission also showed a striking transient increase in the P-R interval following a couplet of ventricular premature complexes (Figure 2), again suggesting the presence of dual A-V nodal pathways with the fast pathway having a longer refractory period than the slow pathway, as is usually the case.