One of the mysteries of the English language finally explained.
A neutral or common point; (also) a person who or thing which remains constant in changing circumstances.
Early 19th century; earliest use found in Samuel Taylor Coleridge (1772–1834), poet, critic, and philosopher. From classical Latin punctum + indifferēns indifferent.
punctum indifferens/ˌpʌŋ(k)təm ɪnˈdɪfərɛnz/
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