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Webster 1913 Edition

Adj.

Tending to advance, promote, or encourage.

Hume.

Adj.

Tending to advance or promote; tending to encourage.

promotive ‎(comparative more promotive, superlative most promotive)

Tending to promote
- 1861, John Stuart Mill, Utilitarianism:
  And consequently, the utilitarian standard, while it tolerates and approves those other acquired desires, up to the point beyond which they would be more injurious to the general happiness than promotive of it, enjoins and requires the cultivation of the love of virtue up to the greatest strength possible, as being above all things important to the general happiness.