Elide

Elide \ih-LAHYD\ , verb;
1. To suppress; omit; ignore; pass over
2. To omit (a vowel, consonant, or syllable) in pronunciation
3. In law, to annul or quash

This word dates to the 1590's as a legal term meaning "to annul, do away with" from Middle French elider (16th century). Elider derives from Latin elidere ("strike out"), which is a combination of ex- + -lidere ("out" + "to strike"). The phonological sense dates to 1796. The word elision entered the language a little before this one (1580's) and comes from the past participle stem of elidere, which is elisionem.

Today's word and the first definition were both taken from Dictionary.com's 'Word of the Day' for Wednesday, February 2
Etymologies come from the Oxford English Dictionary and/or Etymonline.com