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Webster 1913 Edition

Noun.

[L.

incensio

. See

to inflame.]

The act of kindling, or the state of being kindled or on fire.

Bacon.

Noun.

[L. incensio, from incendo, to burn.]

The act of kindling; the state of being on fire.

incension ‎(plural incensions)

The act of kindling, or the state of being kindled or on fire.
(Can we find and add a quotation of Francis Bacon to this entry?)