"condition of being or occupying a continent," 1863, from continent (n.) + -ality. From 1897, a term in meteorology, "measure of the difference between continental and marine climates," from German kontinentalität (1895).
1550s, "continuous tract of land," from continent land (mid-15c.), translating Medieval Latin terra continens "continuous land," from Latin continens "continuous," present participle of continere "to hold together, enclose," from assimilated form of com "with, together" (see con-) + tenere "to hold" (from PIE root *ten- "to stretch").
As "one of the large land masses of the globe" from 1610s. As "the mainland of Europe" (from the point of view of Britain), from c. 1600.
word-forming element; see -al (1) + -ity. Originally also in reduced form -alty, especially in words from French (mayoralty, etc.), hence the occasional doublet such as fealty/fidelity, realty/reality, specialty/speciality, loyalty/legality.
<a href="https://www.etymonline.com/word/continentality">Etymology of continentality by etymonline</a>
Harper, D. (n.d.). Etymology of continentality. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/continentality