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  • sign-in
    sign-in
    noun
    an act, an instance, or a time of signing in.
  • sign in
    sign in
    verb
    to sign or cause to sign a register, as at a hotel, club, etc
Synonyms

sign-in

American  
[sahyn-in] / ˈsaɪnˌɪn /

noun

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


sign in British  

verb

  1. to sign or cause to sign a register, as at a hotel, club, etc

  2. to make or become a member, as of a club

"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

sign in Idioms  
  1. 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.


Etymology

Origin of sign-in

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

Compare meaning

How does sign-in compare to similar and commonly confused words? Explore the most common comparisons:

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

We shouldn’t have to sign-in every time we fire up the laptop and other devices.

From The Wall Street Journal Apr. 15, 2026

It provides a single sign-in portal that verifies and grants appropriate access to various programs.

From Barron's Feb. 5, 2026

She said electrical works were not permitted in council properties and that this was made clear to tenants “at several points” in the tenancy sign-in.

From BBC Nov. 18, 2024

At their most recent park gathering, Bibat and Daniel brought three boxes of Colorado Donuts and two cartons of Starbucks coffee to the park along with name tags, markers and a sign-in book.

From Los Angeles Times Mar. 21, 2024

Maybe because I’m not writing it down on a sign-in sheet for detention or signing an apology for something.

From "Fish in a Tree" by Lynda Mullaly Hunt

A sign in a glass display case says the apfel nusskuchen, or apple nut cake, was “handmade with love” by a woman named Zora.

From The Wall Street Journal Jul. 11, 2026

The media and the money markets hung on his few public statements, and a sign in his office said simply, "the buck starts here".

From BBC Jun. 22, 2026

This week, she took down the Platner sign in their yard.

From The Wall Street Journal Jun. 6, 2026

“Open as usual but dressed for filming” read a sign in the window of the Stripey Badger Bookshop, Coffee Shop and Kitchen.

From Los Angeles Times May 14, 2026

I paint her in her bell-bottom pants and puffy-sleeved blouse with a halo of flowers and a pink peace sign in her hands.

From "Lucky Broken Girl" by Ruth Behar

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