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What do a.m. and p.m. stand for?

unmarked

[uhn-mahrkt] /ʌnˈmɑrkt/
adjective
1.
not marked.
2.
Linguistics.
  1. characterized by the absence of a distinctive phonological feature, as (p), which, in contrast to (b), lacks the distinctive feature of voicing.
  2. characterized by the absence of a grammatical marker, as the singular in English in contrast to the plural, which is typically marked by an -s ending.
  3. neutral with regard to an element of meaning specified by a semantically related item.
  4. occurring more typically than an alternative form.
    Compare marked (def 4).
Origin of unmarked
late Middle English
1400-1450
1400-50; late Middle English; see un-1, marked
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for unmarked

unmarked

/ʌnˈmɑːkt/
adjective
1.
not carrying a mark or marks: an unmarked police car
2.
not noticed or observed
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for unmarked
adj.

c.1400, "having been given no mark," from un- (1) "not" + past participle of mark (v.). Cf. Old Norse umarkaðr. Meaning "not noticed or observed" is recorded from 1530s.

Online Etymology Dictionary, © 2010 Douglas Harper
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15
18
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