Haplology (from Greekhaplóos "simple" and lógos, "speech") is, in spoken language, the elision (elimination or deletion) of an entire syllable through dissimilation (a differentiating shift that affects two neighboring similar sounds). The phenomenon was identified by American philologistMaurice Bloomfield in the 20th century. Linguists sometimes jokingly refer to the phenomenon as "haplogy". As a general rule, haplology occurs in English adverbs of adjectives ending in "le", for example gentlely > gently; ablely > ably.
Basque: sagarrardo > sagardo ('apple cider')
German: Zaubererin > Zauberin (female 'wizard' or 'magician'; male: der Zauberer; female ending -in)
The reverse process is known as dittology. It is less common but encountered in some languages. For instance, in the Northern Kurdish or Kurmanji, numerals "du" ('two, 2') and "sê" ('three, 3') undergo a dittological process when used in counting:
^Trubetskoy, N.S. (1969). "Appendix II: Thoughts on Morphonology". In Baltaxe (transl.), Christiane A. M. (ed.). Principles of Phonology. Berkeley and Los Angeles: University of California Press. p. 305. ISBN0-520-01535-5. By morphonology or morphophonology we understand, as is well known, the study of the utilization in morphology of the phonological means of language. Translated from the German (Grundzüge der Phonologie, Prague, 1939).