Not under the control of a central computer, as in a manufacturing process or experiment.(adjective)
Not connected to a computer or computer network.(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 "offline" in a sentence
"The term "offline" denotes being behind the times, even backwards."
"CMU's researchers could identify only about one third of their subjects in what they called "offline to online recognition.""
"The success of your business both online and offline is very important to us, which is why today we'd like to share a message from David Fischer, our VP of Global Online Sales and Operations:"