Optics: : [op-tiks] - noun. A branch of physics that studies electromagnetic radiation (for example, light and infrared radiation), its interactions with matter, and instruments used to gather information due to these interactions.Optics includes the study of sight. branch of physics that studies electromagnetic radiation (for example, light and infrared radiation), its interactions with matter, and instruments used to gather information due to these interactions.
By 1924, the National Flag Conference, under the leadership of the American Legion and the Daughters of the American Revolution, changed the Pledge's words, 'my Flag,' to 'the Flag of the United States of America.'
If you pledge something such as a valuable possession or a sum of money, you leave it with someone as a guarantee that you will repay money that you have borrowed. He asked her to pledge the house as security for a loan. Synonyms: bind, guarantee, mortgage, engage More Synonyms of pledge. More Synonyms of pledge.