The Collaborative International Dictionary
Subitaneousness
Subitaneous \Sub`i*ta"ne*ous\, a. [L. subitaneus. See Sudden.]
Sudden; hasty. [Obs.]
--Bullokar. -- Sub`i*ta"ne*ous*ness,
n. [Obs.]
Wiktionary
subitaneousness
n. The state, quality, or condition of being subitaneous or sudden; suddenness.