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sign-in

[sahyn-in] /ˈsaɪnˌɪn/
noun
1.
an act, an instance, or a time of signing in.
Origin
1945-1950
1945-50; noun use of verb phrase sign in
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for sign-in
n.

1968, from the verbal phrase; see sign (v.) + in (adv.).

Online Etymology Dictionary, © 2010 Douglas Harper
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