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Webster 1913 Edition

Noun.

[See

Concealment; seclusion; retirement.

The

delitescence

of mental activities.

Sir W. Hamilton.

(Med.)

The sudden disappearance of inflammation.

Noun.

Retirement; obscurity.

delitescence ‎(usually uncountable, plural delitescences)

concealment; seclusion; retirement
The delitescence of mental activities. — Sir W. Hamilton.
(medicine) The sudden disappearance of inflammation.