ESL teachers require a bachelor's degree as well as an ESL teaching certificate. In some states, ESL adult instructors need to gain certification. Typically, a high school diploma is required to work as an ESL private tutor.
Anion Definition: An ionic species having a negative charge. Anion Examples: free chloride in an aqueous table salt (NaCl) solution, singlet oxygen. Table of Common Anions. Return to the Chemistry Glossary Index. By Anne Marie Helmenstine, Ph.D.
Medical Definition of a.c. a.c.: Abbreviation on a prescription meaning before meals; from the Latin ante cibum, before meals. This is one of a number of abbreviations of Latin terms that have traditionally been used in writing prescriptions. Last Editorial Review: 5/13/2016.