Following some discussions, I was led to do a search in the Tanakh using the term "Polygamy": http://en.wikipedia. org/wiki/Polygamy. There are two Hebrew words used for Polygamy in modern Hebrew, I used the second one found in the Israeli dictionary Babylon Dictionary (highlighted in red below):
According to the ABD Pro software, there were 17 occurrences expected statistically, and 21 were found. The third minimal skip had the extension "Polygamy is in man", and one of its letters was found in the term "concubines" in 2 Samuel 20:3:
"And David came to his house at Jerusalem; and the king took the ten women his concubines, whom he had left to keep the house, and put them in ward, and provided them with sustenance, but went not in unto them. So they were shut up unto the day of their death, in widowhood, with their husband alive."