Origin of yes

before 900; Middle English yes, yis, Old English gēse (adv. and noun), probably equivalent to gēa yea1 + be it (present subjunctive singular of bēon to be)
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British Dictionary definitions for yes

yes

/ (jɛs) /

sentence substitute

used to express acknowledgment, affirmation, consent, agreement, or approval or to answer when one is addressed
used, often with interrogative intonation, to signal someone to speak or keep speaking, enter a room, or do something

noun

an answer or vote of yes
(often plural) a person who votes in the affirmative
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Word Origin for yes

Old English gēse, from iā sīe may it be; see yea
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