adverb

1. aye; yea; it is so: the opposite of no, used to express agreement, consent, affirmation, or confirmation
2. not only that, but more; moreover [ready, yes, eager to help]

Etymology: ME < OE gese, yes, prob. < gea, yea + si, be it so, 3d pers. sing., pres. subj., of beon, to be: see be

interjection

1. it is so; aye; yea: the opposite of no
2. Informal good, that's it, I've got it, etc.: spoken emphatically in expressing satisfaction, agreement, pleasure, etc.
3. what is it? do you wish to say (or add) something?: used in inquiry
4. is it so?: used in conversation to express polite interest

noun pl. yeses yes′es

1. the act of saying yes; affirmative reply; agreement
2. an affirmative vote or a person voting this way
   also aye, yea

transitive verb, intransitive verb yessed, yessing yes′·sing