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The Collaborative International Dictionary
Interlinearly

Interlineal \In`ter*lin"e*al\, Interlinear \In`ter*lin"e*ar\, a. Contained between lines; written or inserted between lines already written or printed; containing interlineations; as, an interlinear manuscript, translation, etc. -- In`ter*lin"e*ar*ly, adv.

Wiktionary
interlinearly

adv. 1 Between the lines (of a text). 2 With annotations between the lines.