Etymology
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glad (adj.)

Old English glæd "bright, shining, gleaming; joyous; pleasant, gracious" (also as a noun, "joy, gladness"), from Proto-Germanic *gladaz (source also of Old Norse glaðr "smooth, bright, glad," Danish glad "glad, joyful," Old Saxon gladmod, in which the element means "glad," Old Frisian gled "smooth," Dutch glad "slippery," German glatt "smooth"), from PIE root *ghel- (2) "to shine." Apparently the notion is of being radiant with joy; the modern sense "feeling pleasure or satisfaction" is much weakened. Slang glad rags "one's best clothes" first recorded 1902.

updated on May 15, 2017

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Definitions of glad from WordNet
1
glad (adj.)
showing or causing joy and pleasure; especially made happy;
gave a glad shout
a glad occasion
glad you are here
a glad smile
heard the glad news
glad that they succeeded
glad (adj.)
eagerly disposed to act or to be of service;
glad to help
Synonyms: happy
glad (adj.)
feeling happy appreciation;
glad of the fire's warmth
glad (adj.)
cheerful and bright;
a glad May morning
Synonyms: beaming
2
glad (n.)
any of numerous plants of the genus Gladiolus native chiefly to tropical and South Africa having sword-shaped leaves and one-sided spikes of brightly colored funnel-shaped flowers; widely cultivated;
Synonyms: gladiolus / gladiola / sword lily
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.