Definition of "momently"

And from this chasm, with ceaseless turmoil seething, / As if this earth in fast thick pants were breathing, / A mighty fountain momently was forced: […]

1797, S[amuel] T[aylor] Coleridge, “Kubla Khan: Or A Vision in a Dream”, in Christabel: Kubla Khan, a Vision: The Pains of Sleep, London: […] John Murray, […], by William Bulmer and Co. […], published 1816, page 56

The silent Ocean, and the starlight bay, / The twilight glow, which momently grew less, / The voiceless sands, and dropping caves, that lay / Around them, made them to each other press […]

1819 July 15, [Lord Byron], Don Juan, London: […] Thomas Davison, […], canto II, stanza 188

Huge stones and beams falling momently from the decaying roofs above them, gave evidence, by their sullen and heavy descent, of the vast height of the surrounding houses […]

1835, Edgar Allan Poe, King Pest