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Your definition of conceive “to cause to begin” is the second definition (b) in the Merriam-Webster Dictionary. The first definition (a) is “to become pregnant with.” Mary “became pregnant with” the Second Person of the Trinity.

Salt Lake City says...

Mormons deny the virgin birth of Mary:


The Mormon Church Teaches That:	Our God is an exalted man of flesh and bone He physically lives with His many wives near the star Kolob Worthy Mormon men can also become Gods, like Him Our God is one of many Gods and serves a God of His own! God came down to earth in the flesh and was the physical father of Jesus You should not trust the Bible in this matter. It is wrong. Trust their prophets. Read what the Mormon leaders say about our Savior and the Virgin Mary.

How can Mormons claim they believe in the virgin birth if God had sex with Mary?	They change the definition of the word virgin. Mormons feel that they can still use the phrase "virgin birth" because God was an IMMORTAL being who had sex with Mary, not a mere mortal man. And this is exactly what Bruce McConkie, (top LSD theologian, and one of the Mormon 12 Apostles, died in 1985) said: "For our present purposes, suffice it to say that our Lord was born of a virgin, which is fitting and proper, and also natural, since the Father of the Child was an immortal Being" (The Promised Messiah, pg. 466). In other words, if Joseph had sex with Mary she would not have been a virgin, but since God had sex with Mary, she remains a virgin. By "Virgin birth", Mormons mean that no mortal human had sex with Mary, but since God had sex with Mary, and He is immortal, she remains a virgin!

B. Gods Must Have Wives

If none but gods will be permitted to multiply immortal children, it follows that each God must have one or more wives. God, the Father of our spirits, became the Father of our Lord Jesus Christ according to the flesh. (Orson Pratt, The Seer, page 158)

C. Mary And God Were Married

The fleshly body of Jesus required a Mother as well as a Father. Therefore, the Father and Mother of Jesus, according to the flesh, must have been associated together in the capacity of Husband and Wife; hence the Virgin Mary must have been, for the time being, the lawful wife of God the Father: we use the term lawful Wife, because it would be blasphemous in the highest degree to say that He overshadowed her or begat the Savior unlawfully. (Orson Pratt, The Seer, page 158)

D. Joseph was Her Second Husband

Inasmuch as God was the first husband to her, it may be that He only gave her to be the wife of Joseph while in the mortal state, and that He intended after the resurrection to again take her as one of his own wives to raise up immortal spirits in eternity. (Orson Pratt, The Seer, page 158)
The man Joseph, the husband of Mary, did not, that we know of, have more than one wife, but Mary the wife of Joseph had another husband. (Brigham Young, Journal of Discourses, 11:268)

E. The Bible Is Wrong

Joseph Fielding Smith, 10th Prophet of the Mormon Church: "They tell us the Book of Mormon states that Jesus was begotten of the Holy Ghost. I challenge that statement. The Book of Mormon teaches No Such Thing! Neither does the Bible!" (Doctrines of Salvation, Vol. 1:18)

F. God Is A Man

"Christ was begotten of God. He was NOT born without the aid of man and that man was God!" (Doctrines of Salvation, Vol. 1:18)

G. An Act Of The Flesh

The birth of the Savior was as natural as are the births of our children; it was the result of natural action. He partook of flesh and blood- was begotten of his Father, as we are of our fathers. (Brigham Young, Journal of Discourses, 8:115)
In relation to the way in which I look upon the works of God and his creatures, I will say that I was naturally begotten; so was my father, and also my Savior Jesus Christ. According to the Scriptures, he is the first begotten of his father in the flesh, and there was nothing unnatural about it. (Heber C. Kimball, Journal of discourses, 8:211)

H. Not Of The Holy Ghost

''When the Virgin Mary conceived the Jesus, the Father had begotten him in his own likeness. He was not begotten by the Holy Ghost... (Brigham Young, Journal of Discourses, Vol. 1:50-51)
'What a learned idea' Jesus, our elder brother was begotten in the flesh by the same character that was in the garden of Eden, and who is our Father in heaven." (Brigham Young, Journal of Discourses, Vol. 1:50-51)
'Now Remember from this time forth, and forever, hat Jesus Christ was not begotten by the Holy Ghost. will repeat a little anecdote. I was in conversation with a certain learned professor upon this subject when I replied to this idea- "If the son was begotten y the Holy Ghost, it would be very dangerous to baptize and confirm females and give the Holy Ghost o them, lest he should beget children to be palmed off on the Elders by the people, bringing the Elders into great difficulties."...But what do the people in Christendom, with the Bible in their hands, know but this subject? Comparatively Nothing." (Brigham Young, Journal of Discourses, Vol. 1:50-51)

I. Bruce R. McConkie, deceased member of the 12 Apostles (d.1985) and leading LDS theologian, writes in Mormon Doctrine:

SON OF GOD: God the Father is a perfected, glorified, holy Man, an immortal Personage. And Christ was born into the world as the literal Son of this Holy Being; he was born in the same personal, real, and literal sense that any mortal son is born to a mortal father. There is nothing figurative about his paternity; he was begotten, conceived and born in the normal and natural course of events, for he is the son of God, and that designation means what it says.—page 742
SON OF MAN: Christ is the Son of Man, meaning that his Father (the eternal God!) is a Holy Man. "In the language of Adam, Man of Holiness" is the name of God. Page 742
SON OF MARY: ...but the Holy ghost is not the Father of Christ and when the Child was born, he was "the Son of the eternal Father. —page 743
ONLY BEGOTTEN SON: These name-titles all signify that our Lord is the only Son of the Father in the flesh. Each of the words is to be understood literally. Only means only, begotten means begotten, and Son means son. Christ was begotten by an Immortal Father in He same way that mortal men are begotten by mortal fathers. —page 546

From here ---> http://www.bible.ca/mor-god-had-sex-with-mary.htm