Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
illātĕnus or illactĕnus, adv. [illetenus], so far (post-class. and very rare): navitas precum ejus (Arionis) commiseritum esse illactenus, ut, etc., Gell. 16, 19, 11: litteras illatenus, qua dixi, legendas praebebat, App. Mag. p. 326; cf. Fronto Ter. Als. 4.