/eb'euh lish"euhn/ , n.
1. a seething or overflowing, as of passion or feeling; outburst.
2. the state of being ebullient.
3. the act or process of boiling up.
4. a rushing forth of water, lava, etc., in a state of agitation.
[ 1525-35; ebullition- (s. of ebullitio ), equiv. to ebullit ( us ) (ptp. of ebullire to boil up ebulli- (see EBULLIENT) + -tus ptp. suffix) + -ion- -ION ]