Late 16th century; earliest use found in William Bourne (c1535–1582), writer on mathematics. Alteration of longitude, probably after other nouns ending in -titude.
Definition of longtitude in US English:
longtitude
noun
Longitude.
Origin
Late 16th century; earliest use found in William Bourne (c1535–1582), writer on mathematics. Alteration of longitude, probably after other nouns ending in -titude.