Definition of yeah
informal
: yes
"Are you ready?" "Yeah, I'm ready." "Do you want to come?" "Yeah, sure." Oh yeah, I gotta vote. — Harper's "Is that one the dressing room?" asked Bean, pointing to the section with the dresser and the folding screen. "Yeah."— Annie Barrows "At first I was all, 'Me? A hero?' And then I got to thinking about it and I realized that, yeah, I am a hero …"— Rob Long Yeah, yeah, yeah, you're a beautiful lover.— Irvine Welsh Yeah, it comes from classical music, but it comes from other places, too …— David M. Yaffe When the cowboy would say something like, "Things are quiet around here tonight," she would join in with, "Yeah, too quiet," right on cue.— Betsy Byars
—often used sarcastically in phrases like yeah, right and yeah, sure to express doubt or disbelief "I'm a really big fan," gushed [Al Gore]. "Yeah, right," sneered Miss Love.— Mark Steyn… she claims technologies like peer-to-peer file swapping are about to put record companies out of business. Yeah, right. — Smart BusinessA "Yeah, sure," reaction from many in the archaeological community to gaudy claims about Warm Mineral Springs was not surprising.— John Skow
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Merriam-Webster unabridged
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Time Traveler for yeah
The first known use of yeah was in 1863
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