say it: rej-i-STRAY-shuhn
registration is a noun meaning "the act of enrolling". It carries 5 recorded senses.
the act of enrolling
the body of people (such as students) who register or enroll at the same time
a document certifying an act of registering
(music) the sound property resulting from a combination of organ stops used to perform a particular piece of music; the technique of selecting and adjusting organ stops
music
the act of adjusting something to match a standard
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for registration come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.