English▸ noun [mass noun] technical, or archaic the action of bubbling or boiling:
because the bath is now so cold, no further violent ebullition will occur.
▪ [count noun] a sudden outburst of emotion or violence:
an ebullition of pure hatred.
– ORIGIN late Middle English (denoting a state of agitation of the bodily humours): from late Latin ebullitio(n-), from ebullire ‘boil up’ (see ebullient).