To make glad; to gladden or bring joy to someone.
From en- + gladden (itself from glad + -en, a verb-forming suffix). This creates a reinforced version of 'gladden,' though both words mean essentially the same thing.
Medieval writers loved stacking prefixes and suffixes like this—'engladden' instead of just 'gladden'—but English speakers pruned these redundancies over time, keeping only what felt natural to say.
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