Entry 1 sense Webster, 1913 Anomalous /ən-äm'-əl-əs/ · A·nom·a·lous · IPA /əˈnɑmələs/ 01 a. Deviating from a general rule, method, or analogy; abnormal; irregular; as, an anomalous proceeding. 1. Deviating from a general rule, method, or analogy; abnormal; irregular; as, an anomalous proceeding.