Nightfall over Manhattan.
nightfall definition by Webster's New World
Webster\'s New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
the time in the evening when daylight is last visible; dusk
nightfall definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The approach of darkness; dusk.
nightfall definition by Wiktionary