NC-17 (?n?s?-s?v??n-t?n?) A trademark for a movie rating indicating that admission will not be granted to anyone under the age of 18.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.n/c no charge. NC 1. network computer. 2. no charge. 3. Also, N.C. North Carolina. 4. Nurse Corps. NC-17 Trademark. no children under 17: a motion-picture rating advising that persons under the age of 17 will not be admitted to the film. Compare G (def. 2), PG, PG-13, R (def. 4), X (def. 8). Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.