The word is a variant of the more usual Esperanto word ‘kari(ta)to’ and can be found in this shorter form in the all-Esperanto dictionary ‘Plena Vortaro de Esperanto’. It is an obvious cognate with the Latin ‘caritas’, as found in the first line of the well-known verse:

Ubi caritas et amor, Deus ibi est.
Congregavit nos in unum Christi amor.
Exultemus, et in ipso iucundemur.
Timeamus, et amemus Deum vivum.
Et ex corde diligamus nos sincero.

The seven points of Esperanto’s Prague Manifesto:
http://lingvo.org
expand on the theme of ‘karito’ from the point of view of ‘universal bilingualism’
[YOUR ethnic language + non-ethnic Esperanto for all].