anomaly

/əˈnɒməlɪ/noun

Something that departs from the usual pattern or expected rule.

Example sentences

“A warm day in midwinter is an anomaly around here.”
“The accountant spotted an anomaly in the sales figures.”

At home in scientific and technical writing: a statistical anomaly, an anomaly in the data. "Oddity" is the everyday equivalent.

Related words

antennaA device that sends or receives radio and other electromagnetic signals, converting them to or from electrical form.annoyanceThe feeling of being irritated or mildly angered.antibioticA substance that kills bacteria or stops similar microorganisms from growing.anniversaryThe date each year that marks an exact number of years since an important event took place.anticipateTo act ahead of someone or something, often in order to stop an action before it happens.ankleThe joint that links the foot to the leg, together with the surrounding lower leg and upper foot.