JOIN

join: Of the New Testament words, kollao, literally, "glue," "weld together," and its compounds, designate the closest form of personal union, as in Luke 15:15; 1 Corinthians 6:16; Ephesians 5:31. In the words of institution of marriage, suzeugnumi is used (Matthew 19:6; Mark 10:9, literally, "yoke together"; compare Genesis 2:24).

From the International Standard Bible Encyclopedia
Edited by James Orr, published in 1939 by Wm. B. Eerdmans Publishing Co.