not closely or intimately connected or associated; distant; remote: an arm's-length relationship.
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British Dictionary definitions for arm's-length
lacking intimacy or friendliness, esp when possessing some special connection, such as previous closeness: we now have an arm's-length relationship
(of commercial transactions) in accordance with market values, disregarding any connection such as common ownership of the companies involved
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012