[f. TACKY a.2 + -NESS.] The quality of being tacky or slightly adhesive.

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1883.  R. Haldane, Workshop Receipts, Ser. II. 184/2. This varnish … retains sufficient tackiness to hold powdered graphite on its surface.

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1908.  Installation News, II. 55/1. No doubt the ‘tackiness’ of the enamel also helps to hold the tube in place.

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