n. The husband of one's biological mother, other than one's biological father, especially following the divorce or death of the father.
the GNU version of the Collaborative International Dictionary of English
n. The husband of one's mother by a subsequent marriage.
The Century Dictionary and Cyclopedia
n. A man who is the husband of one's mother, but is not one's father.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the husband of your mother by a subsequent marriage
Word Usage
"No problem … his stepfather is well positioned to fix him up through Indonesian banks with funds to replace the money Qaddafi is no longer going to pay."