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[bach-uh-ler, bach-ler]
an unmarried man.
a person who has been awarded a bachelor's degree.
a fur seal, especially a young male, kept from the breeding grounds by the older males.
Also called bachelor-at-arms. a young knight who followed the banner of another.
Also called household knight. a landless knight.

1250–1300; Middle English bacheler < Old French < Vulgar Latin *baccalār(is) farm hand; akin to Late Latin baccalāria piece of land, orig. plural of *baccalārium dairy farm, equivalent to *baccālis of cows (bacca, variant of Latin vacca cow + -ālis -al1) + -ārium place

bachelorlike, adjective
bachelorly, adjective
nonbachelor, noun
prebachelor, adjective, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bachelor (ˈbætʃələ, ˈbætʃlə)
1.  a.  an unmarried man
 b.  (as modifier): a bachelor flat
2.  a.  a person who holds the degree of Bachelor of Arts, Bachelor of Education, Bachelor of Science, etc
 b.  the degree itself
3.  Also called: bachelor-at-arms (in the Middle Ages) a young knight serving a great noble
4.  bachelor seal a young male seal, esp a fur seal, that has not yet mated
[C13: from Old French bacheler youth, squire, from Vulgar Latin baccalāris (unattested) farm worker, of Celtic origin; compare Irish Gaelic bachlach peasant]
usage  Gender-neutral form: single person

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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Word Origin & History

c.1300, "youthful knight, novice in arms," from O.Fr. bacheler (11c.) "knight bachelor," a young squire in training for knighthood, probably from M.L. baccalarius "vassal farmer," one who helps or tends a baccalaria "section of land." Or from L. baculum "a stick," since the squire would practice with
a staff, not a sword. Meaning evolved 14c. from "knight in training" to "junior member of a guild or university" to "unmarried man" (late 14c.), an evolution that paralleled the word's development in French. Bachelor party is first recorded 1922.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Nerd social maladroitness, rather than arrogance, is the key to understanding
  this bachelor's behavior.
Twenty-two per cent of bachelor's degrees are awarded in that field.
He had received bachelor's, master's and doctoral degrees there.
He even talks of pursuing a bachelor's degree in engineering some day, and
  opening his own business.
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