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From The Collaborative International Dictionary of English v.0.48:
Jointing \Joint"ing\, n. The act or process of making a joint; also, the joints thus produced. [1913 Webster] Jointing machine, a planing machine for wood used in furniture and piano factories, etc. Jointing plane. See Jointer, 2. Jointing rule (Masonry), a long straight rule, used by bricklayers for securing straight joints and faces. [1913 Webster]