2. the act of walking out (of a meeting or organization) as a sign of protest; - Example: "there was a walkout by the Black members as the chairman rose to speak"
WordNet (r) 3.0 (2006):
walkout
n 1: a strike in which the workers walk out
2: the act of walking out (of a meeting or organization) as a
sign of protest; "there was a walkout by the Black members as
the chairman rose to speak"