1. The act of belching wind from the stomach; a belch.
2. A violent belching out or emitting, as of gaseous or other matter from the crater of a volcano, geyser, etc.
["belching," 1533, from L. eructatio (gen. eructationis) "a belching forth," from eructatos, pp. of eructare, from ex- "out" + ructare "to belch," from PIE *reug- "to belch" (cf. Lith. rugiu "to belch," Gk. eryge, Arm. orcam), probably of imitative origin.]
eructation. Dictionary.com Unabridged (v 1.1) Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc. http://dictionary.reference.com/search?r=2&q=Eructation (accessed: April 18, 2008).
Bob remembered hearing that in Japan it was considered a great compliment to belch after a meal. His eructation did not have the desired effect. His date, freshly back from the bathroom, looked horrified; all the other patrons stared. Apparently it was not considered a compliment at a fancy French restaurant.