reduplication: repetition of part or all of a word or stem in order to change its meaning. The meaning changes typically involve ideas closely related to that of repetition, for instance plurality, repetition of an action, intensity, etc. For instance, the (Tetelcingo Nahuatl) form "kimati" 'he/she knows it' is built on the stem "mati" 'to know'; this word can have the reduplicated form "kimahmati", which can mean things like 'they know it', 'he/she knows them', and 'he/she knows it well'. [Spanish: reduplicación]