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The Collaborative International Dictionary
Illegitimation

Illegitimation \Il`le*git`i*ma"tion\, n.

  1. The act of illegitimating; bastardizing.

  2. The state of being illegitimate; illegitimacy. [Obs.]

    Gardiner had performed his promise to the queen of getting her illegitimation taken off.
    --Bp. Burnet.

Wiktionary
illegitimation

n. 1 (context obsolete English) The act of making illegitimate; bastardization. 2 (context obsolete English) The state of being illegitimate; illegitimacy.