American Heritage Dictionary
(1)
Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
Ibn al-Haytham is regarded as the "father of modern optics" [10] for his influential Book of Optics (written while he was under house arrest), which correctly explained and proved the modern intromission theory of vision.— Bloggers.Pakistan
The female offspring of High LG mothers showed a reduced lordosis rating, a decreased mount: intromission ratio, received fewer ejaculations and were less likely to achieve pregnancy following mating in the paced mating context.— CiteULike: Everyone's library
Mount occurred for less than 3 sec without intromission and thrusting, and were usually associated with female resistance.— PLoS ONE Alerts: New Articles
Copulation in which intromission and thrusting were unambiguously observed (video by Daniela Antonacci via Canon DM MV 600-18× optical zoom / 2. 8-50 mm equivalent / Canon Video Lens).— PLoS ONE Alerts: New Articles

American Heritage Dictionary (1)
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