Definition of "officiously"

Slipping then a pillow under me, that I might give him the fairest play, I guided officiously with my hand this furious battering ram, whose ruby head, presenting nearest the resemblance of a heart, I applied to its proper mark, which lay as finely elevated as we could wish

1749, [John Cleland], “(Please specify the letter or volume)”, in Memoirs of a Woman of Pleasure [Fanny Hill], London: […] G. Fenton [i.e., Fenton and Ralph Griffiths] […]