sign-in

[ sahyn-in ]
/ ˈsaɪnˌɪn /

noun

an act, an instance, or a time of signing in.

Origin of sign-in

First recorded in 1945–50; noun use of verb phrase sign in

Definition for sign in (2 of 2)

Origin of sign

1175–1225; (noun) Middle English signe < Old French < Latin signum mark, sign, ensign, signal, image; (v.) Middle English signen to mark with a sign, especially the sign of the cross < Old French signer < Latin signāre to mark with a sign, inscribe, affix a seal to, derivative of signum

SYNONYMS FOR sign

1, 4 signal.
10 indication, hint, augury. Sign, omen, portent name that which gives evidence of a future event. Sign is a general word for whatever gives evidence of an event—past, present, or future: Dark clouds are a sign of rain or snow. An omen is an augury or warning of things to come; it is used only of the future, in general, as good or bad: birds of evil omen. Portent, limited, like omen, to prophecy of the future, may be used of a specific event, usually a misfortune: portents of war.

Related forms

sign·less, adjectivesign·like, adjectivepost·sign, verb (used with object)un·signed, adjective

Can be confused

sign sing (see synonym study at the current entry)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for sign in (1 of 2)

sign in


verb (adverb)

to sign or cause to sign a register, as at a hotel, club, etc
to make or become a member, as of a club

British Dictionary definitions for sign in (2 of 2)

sign

/ (saɪn) /

noun

verb

Derived Forms

signable, adjective

Word Origin for sign

C13: from Old French signe, from Latin signum a sign
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

Medicine definitions for sign in

sign

[ sīn ]

n.

An objective finding, usually detected on physical examination, from a laboratory test, or on an x-ray, that indicates the presence of abnormality or disease.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for sign in

sign

[ sīn ]

A body manifestation, usually detected on physical examination or through laboratory tests or xrays, that indicates the presence of abnormality or disease. Compare symptom.
See symbol. See Table at symbol.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Idioms and Phrases with sign in (1 of 2)

sign in


Record one's arrival by signing a register, as in He signed in both himself and his wife. [c. 1930] For the antonym, see sign out.

Idioms and Phrases with sign in (2 of 2)

sign


In addition to the idioms beginning with sign

  • sign in
  • sign off
  • sign on
  • sign one's own death warrant
  • sign on the dotted line
  • sign out
  • sign over
  • sign up

, see

  • high sign
  • show signs of
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.