English Reference
adjective · noun

definitive

adj. · n.
US /dɪˈfɪnɪtɪv/ UK /dɪfˈɪnɪtˌɪv/ de·fin·i·tive

  1. 01 B2 Upper Intermediate

    adj.the best and most complete version of something that everyone trusts.

    adj.providing a firm conclusion or being the most authoritative of its kind.

    Simple

    This is the definitive book on the history of jazz.

    In context

    Scholars consider this biography to be the definitive account of the poet's life, as it incorporates previously undiscovered letters and journals.

    Usage

    often used to describe books, biographies, or studies.

    Teacher's tip

    Learners often confuse this with 'definite'. While 'definite' means certain, 'definitive' means it is the final, highest-quality version.

  2. 02 B2 Upper Intermediate

    adj.a final decision or answer that ends all doubt or talking.

    adj.conclusive and final; bringing an end to a process or debate.

    Simple

    The court gave a definitive ruling on the case yesterday.

    In context

    The laboratory results provided definitive proof that the water supply had been contaminated by industrial runoff.

  3. 03 C2 Proficiency Technical

    n.a regular stamp used for everyday mail, not a special one for a holiday.

    n.a postage stamp issued as part of a regular series for indefinite use, rather than a commemorative issue.

    Simple

    He added a common definitive to his stamp collection.

    In context

    While commemorative stamps attract casual collectors, serious philatelists often focus on the subtle plate variations found in long-running definitives.

    Usage

    usually used by collectors or postal workers.

    standard issue
  4. 04 C2 Proficiency TechnicalAcademic Science

    n.a word like 'the' or 'this' that points to a specific thing.

    n.a word, such as a definite article or demonstrative, that serves to define or limit the reference of a noun.

    Simple

    The teacher explained how a definitive helps identify a specific noun.

    In context

    The linguist argued that the definitive functions as a functional head within the noun phrase structure.

    Usage

    used in formal linguistic analysis.

    Teacher's tip

    In modern grammar, these are more commonly referred to as 'determiners'.

    determiner

Usage definitive answer

Now, new data from NASA's Hubble Space Telescope show definitive evidence of a dwarf galaxy merging with the young Milky Way in the earliest phases of its evolution.

Phys.org· 17 Aug 2026

This means there is no definitive list of symptoms or treatments available to those worried they may be addicted.

BBC News· 8 Aug 2026

From Middle French définitif.

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

This entry
Origin frm définitif
Level B2 · Upper Intermediate
Frequency Frequent
Updated