From Latin accensiōnem, from accendere.
accension (plural accensions)
- (obsolete) The act of kindling or the state of being kindled; ignition.
- 1646, Thomas Browne, Pseudodoxia Epidemica, II.5:
- From Small-coal ensueth the black colour and quick accension; for neither Brimstone nor Petre, although in Powder, will take fire like Small-coal [...].