In woodworking, irregularity caused by a twist or other deviation in the alignment of a form; also, a varying from exactness in a structural member.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
Not in exact alignment (as a part which is slightly twisted).
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.