gram·ma·tol·o·gy (gr?m??-t?l??-j?)n. The study and science of systems of graphic script.[Greek gramma, grammat-, letter; see grammar + -logy.]gram?ma·to·log?ic (-t?-l?j??k), gram?ma·to·log?i·cal adj.gram?ma·tol?o·gist n.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.grammatology (??ræm??t?l?d??) n (Linguistics) the scientific study of writing systems ?gramma?tologist nCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014