Princess is a hybrid, and a nice illustration of how a borrowed suffix becomes native equipment. Prince came from French; the ending -ess is also French, from Latin -issa and ultimately Greek; but princess itself, in the late 1300s, appears to be an English formation rather than a borrowing of Old French princesse. English had taken the ending in on enough words — countess, duchess, mistress — that it could make new ones unaided.
That is the test for whether a suffix has been naturalised: not whether it is foreign in origin, but whether English can attach it to something new. The word meant a woman of royal birth, or a ruler's daughter or wife, from the start. As a colloquial form of address to a woman it is recorded from 1924, though as a term for a lover it goes back to the early 1400s.
princess (n.) late 14c., "woman of royal or noble birth; daughter or wife of a ruler or prince; female ruler," a native formation; in some later instances from Old French princesse , fem. of prince (see prince ). Compare Medieval Latin principissa , Italian principessa . As a colloquial form of address to a woman or girl, it is recorded by 1924 (as a term of address to a lover, early 15c.). Princesse lointaine "ideal but unattainable woman" (literally "distant princess") is from the play by Rostand (1895) based on troubadour themes. also from late 14c.
princess came in through Norman French, and its spelling follows that family's conventions.
How that family writes these sounds
| the noun endings | -age, -ance/-ence, -ment, -ery, -ess, -etvillage, patience, judgment, bakery, princess, pocket |
What gives it away on the page
| -age, -ance/-ence, -ment, -ery, -ess, -et | The workhorse French endings.village, patience, judgment, bakery, princess, pocket |
Placing it without the spelling
| court, church, cuisine, fashion, art, anything a ruler did | Norman Frenchvillage, patience, judgment, princess |
Norman French in the spelling guide · guess another word's family