When educators approach the topic of English as a Second Language, there are many terms for teachers, administrators, and principles to remember. Many of the terms in this educational realm are consistently misused because of how subtle the differences can be. Though the differences are subtle, they can be vitally important when developing an ESL program or understanding learners, assessments, and professional titles. This is a comprehensive, alphabetized list describing many of the most important and common ESL terms and their definitions to ensure your program is utilizing the correct language in training, marketing, planning, and hiring.