spontaneously

adv

1. In a spontaneous manner; naturally; voluntarily.

   “The idea that the body could spontaneously ignite was promoted by the 19th-century temperance movement.”

   “Smaller-scale isolated deaf-education programs had existed previously in 20th-century Nicaragua, Shepard-Kegl says, but the critical mass needed to spontaneously develop Nicaraguan Sign Language only occurred with the opening of Melania Morales.”