Consisting of or being direct communication or exchange between two people: one-on-one instruction. (adjective)
Sports Playing directly or exclusively against a single opponent.(adjective)
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 "one-on-one" in a sentence
"Finn said Spoon's albums often start with singer Britt Daniel and McCarthy working one-on-one, which is exactly where I was coming from."
"I’m not trying to get my heart broken again in a so-called one-on-one relationship."
"We view discipline as a one-on-one opportunity to shape character and convey lessons that should occur just between parent and child."