What is Fluency? There are many different thoughts on fluency and its definition, and this can be confusing to a lot of non-native speakers. So, what exactly is fluency then? Well, fluency is “the ability to express yourself in a language in a manner that the person you are speaking to can understand the message you are trying to convey”. Fluency does not mean that you know everything about the language and its rules. So, now when you look at the word fluency you will understand it differently and thus not put higher than expected expectations on yourself that will hinder your progress and goals.