Definition of "invisible" []

• Impossible to see; not visible: Air is invisible. (adjective)
• Not accessible to view; hidden: mountain peaks invisible in the fog. (adjective)
• Not easily noticed or detected; inconspicuous: "The poor are politically invisible” ( Michael Harrington). (adjective)
• Not published in financial statements: an invisible asset. (adjective)
• One that is invisible. (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.

• "The _invisible_ life on this planet is unquestionably far greater than the _visible_ but both visible and invisible doubtless belong to the planet earth."
• "Warren Samuels, a professor at Michigan University who died in August, set about investigating what the originator of the term invisible hand, the influential 18th-century economic thinker Adam Smith, meant by the term and examine how it is applied."
• "He described how current offshoots like al-Awlaki's al-Qaedaof the Arabian Peninsula in Yemen are cooperating with militants in Somalia, describing what he called an "invisible bridge" between the two."