some·day

[suhm-dey]
adverb
at an indefinite future time.

Origin:
before 900; Middle English sum day, Old English sum dæg; see some, day


The adverb someday is written solid: Perhaps someday we will know the truth. The two-word form some day means “a specific but unnamed day”: We will reschedule the meeting for some day when everyone can attend.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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World English Dictionary
someday (ˈsʌmˌdeɪ) [Click for IPA pronunciation guide]
 
adv
at some unspecified time in the (distant) future

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Someday is always a great word to know.
So is doohickey. Does it mean:
the offspring of a zebra and a donkey.
a gadget; dingus; thingumbob.
Example sentences
Someday, changing rockets on the moon may seem as ordinary as switching planes in an airport.
Someday, perhaps, we'll be in the mood to experiment again.
But how that awareness might someday progress to remedial action-the removal of
  orbital debris-remains unclear.
Maybe even allow a commander to fire a missile from one someday.
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