the GNU version of the Collaborative International Dictionary of English
adj. Having the power of uniting; causing, or tending to produce, union.
The Century Dictionary and Cyclopedia
Having the power of uniting; causing or tending to unite; producing or promoting union; harmonizing.
Word Usage
"What such sources do is present arguments, based on Scripture, Tradition, and natural law, that the "unitive" significance of sexual intercourse cannot be had without procreative significance."