The phrase "fluent speakers" refers to people who can speak a language easily and confidently, without struggling or making many mistakes. Full definition
«More schools are embracing dual immersion language programs, helping children become fluent speakers in two languages by the time they graduate high school,» said Sarah DiFrancesco, Vice President of Business Development for Barnes & Noble. (goodereader.com)
Data on the number and location of surviving fluent speakers of endangered languages are scant, but Amano and colleagues used the most complete source available — an online repository called Ethnologue — for their analysis, he says. (sciencemag.org)