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Webster 1913 Edition

Adj.

[L.

impetrativus

obtained by entreaty.]

Of the nature of impetration; getting, or tending to get, by entreaty.

[Obs.]

Bp. Hall.

Adj.

Obtaining; tending to obtain by entreaty.

impetrative ‎(not comparable)

(obsolete) Of the nature of impetration; getting, or tending to get, by entreaty.

impetrative prayer

(Can we find and add a quotation of Bishop Hall to this entry?)