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From The Collaborative International Dictionary of English v.0.48:
Ostensibly \Os*ten"si*bly\ ([o^]s*t[e^]n"s[i^]*bl[y^]), adv. In an ostensible manner; avowedly; professedly; apparently. --Walsh. [1913 Webster] Ostensibly, we were intended to prevent filibustering into Texas, but really as a menace to Mexico. --U. S. Grant. [1913 Webster]