n. a vertical post from which a gate is hung/attached.
the GNU version of the Collaborative International Dictionary of English
n. A post to which a gate is hung; -- called also swinging post or hinging post.
n. A post against which a gate closes; -- called also shutting post.
The Century Dictionary and Cyclopedia
n. One of the side-posts that support a gate.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. either of two posts that bound a gate
Word Usage
"Consider the remarkable moment in Michael Ondaatje's "The English Patient" when Katherine ends her affair with Count Almasy: "Her head sweeps away from him and hits the side of the gatepost.""