Time in the past, especially the recent past.(noun)
On the day before the present day.(adverb)
A short while ago.(adverb)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "yesterday" in a sentence
"˜Socrates came yesterday,™ ˜yesterday™ tells us the pertinent time) and those that indicate place."
"Hillary's win yesterday is important because no one knows how many superdelegates are going to back her but the Puerto Rico win certainly won't * decrease* that number."
"We were extracted by snow cat half way through a winter survival skills course with the Canadian military following the word yesterday morning about Columbia."