Etymology 1

Adjective

1. Being in a state of astonishment, wonder, expectation, or eager attention; as with mouth hanging open.
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5. open wide.
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   • 2004, Jeffrey C. Carrier, John A. Musick, & Michael R. Heithaus, Biology of Sharks and their Relatives‎, page 171

     If the slightly agape mouth is closed prior to mouth opening, this is termed the preparatory phase and is more common in suction-feeding bony fishes than elasmobranchs.

Adverb

1. In a state of astonishment, wonder, expectation, or eager attention.
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3. }
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5. open wide.
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   • 1996, Perri O'Shaughnessy, Invasion of Privacy‎, page 508

     The bathroom door stood agape, and the peeling vinyl floor was bare.

   • 2005, Terry Goodkind, Chainfire‎, page 427

     He glanced up into Richard's eyes, his own wide with wonder, his mouth hanging agape.

Noun

1. the asexual love of God or Christ for mankind, or the asexual love of Christians for others.
2. asexual, spiritual love.
3. a love feast, especially one held in the early Christian Church in connection with the eucharist.