Used as a form of address for such a person. (noun)
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 "sensei" in a sentence
"When addressing a teacher in the West, a student might say, “Excuse me, Mr. Smith,” but in Japan, the term sensei without a name is sufficient."
"We use Japanese in our class, but I guess our sensei is a traditionalist."
"It might take a decade to happen, but we all know it will, because our sensei is just that good."