Kajira is the term for female slave or "slave-girl" in John Norman's Gor novels. Slaves in the Gorean lifestyle will refer to themselves as kajirae. The phrase "la kajira" is said to mean "I am a slave-girl" in the main Gorean language (the most widely-spoken lingua franca in the known regions of the planet Gor); this is one of the few complete Gorean-language sentences given in the Gor novels.
The word is usually seen in the feminine form "kajira" (plural "kajirae"), as most slaves in the Gorean lifestyle are female. The corresponding masculine forms are "kajirus" and "kajiri". (These words follow the rules of nominative adjective morphology in the Latin language, as seen also with words such as "alumnus"/"alumna", etc.) The construction "kajiras" is incorrect, but is occasionally seen in third-party writing
For further information and explanations, see the relevant entries in article Gor - Dictionary.