- The act or process of concentrating, especially the fixing of close, undivided attention. (noun)
- The condition of being concentrated. (noun)
- Something that has been concentrated. (noun)
- Chemistry The amount of a specified substance in a unit amount of another substance. (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.