English Reference
adjective · noun

fluent

adj. · n.
US /ˈfɫuənt/ UK /flˈuːənt/ flu·ent

  1. 01 B2 Upper Intermediate

    adj.able to speak or write a language easily, quickly, and without many mistakes.

    adj.capable of using a language accurately, rapidly, and with natural flow. Usually implies a high level of competence but not necessarily native-level mastery.

    Simple

    After living in Berlin for three years, he became fluent in German.

    In context

    The job description requires candidates to be fluent in at least two European languages to facilitate communication with international clients.

    Pitfall
    She is fluent to Spanish. She is fluent in Spanish.

    Use the preposition 'in' when naming the language someone speaks fluently.

  2. 02 C1 Advanced Literary

    adj.moving or flowing in a smooth and graceful way.

    adj.characterised by a smooth, easy, and graceful flow of movement or style.

    Simple

    The dancer's movements were fluent and beautiful to watch.

    In context

    The pianist's performance was marked by a fluent technique that made the most difficult passages seem effortless.

  3. 03 C2 Proficiency Technical Computing

    adj.a style of writing computer code that is easy to read, almost like a sentence.

    adj.relating to an object-oriented API whose design relies on method chaining to create a more readable, prose-like flow.

    Simple

    The library uses a fluent interface to make the configuration code easier to read.

    In context

    By implementing a fluent interface, the developers allowed users to chain multiple method calls into a single, legible statement.

  4. 04 C2 Proficiency ArchaicTechnical Math

    n.an old word for a changing value in math.

    n.a continuous variable, particularly one that changes with respect to time in Newtonian calculus.

    Simple

    In his early papers, the mathematician referred to the changing quantity as a fluent.

    In context

    Newton's method of fluxions treated the fluent as a quantity generated by a continuous motion over time.

Starting earlier and becoming highly fluent were also linked to a stronger effect.

ScienceDaily· 22 Aug 2026

Understanding narratives is key to becoming a fluent reader in the later grades.

The Conversation· 28 Jul 2026

From Latin fluens (“flowing”), present active participle of fluō (“I flow”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Latin fluens
Level B2 · Upper Intermediate
Frequency Frequent
Updated