short timber binding together upright posts
• (n.) In any framed work, a horizontal tie other than sill and plate or other principal ties, securing uprights to one another.
In'ter·tie` noun (Architecture) In any framed work, a horizontal tie other than sill and plate or other principal ties, securing uprights to one another. 
In architecture an intertie is a horizontal tie other than a sill and plate or other principal tie, securing uprights to one another.
A horizontal member in structural framing, between the head and the sill.