To put one's body into a posture or series of postures, especially hoping that one will be noticed and admired
Example: "If you're finished posturing in front of the mirror, can i use the bathroom now?"
To pretend to have an opinion or a conviction
Example: "The politicians couldn't really care less about the issue: they're just posturing for the media."
To place in a particular position or attitude; to pose.
Example: "To posture oneself; to posture a model"