noun Download 🔗Share A directory of all the phone numbers used in a district. Examples : "To find the number for the local bakery, I looked it up in the phone book. " communication list technology utility service writing device Chat with AIVocabulary GamePractice Reading
noun Download 🔗Share (by extension) A large lookup table. Examples : "The school's internal phone book is a large lookup table that helps staff quickly find each student's contact information. " technology computing communication internet Chat with AIVocabulary GamePractice Reading