Definition of "viral" []

• Of, relating to, or caused by a virus. (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.

• "People have been sharing movie trailers online before the term "viral video" even existed, and trailers are shared more than twice as often as other video content!"
• "That lends a whole new meaning to the term viral marketing."
• "Taking a cue from the national-security agencies that scan emails, phone calls and online discussions in order to see patterns in "intelligence chatter," Don coined the term "viral chatter" to suggest the possibility of detecting signals created by new and emerging viruses well before they reach the wider human population."