Definition

1. Adjective:
   • Providing reasonable grounds for belief or acceptance: Used to describe evidence, arguments, or cases that are strong enough to be accepted as true or valid until proven otherwise.
   • Based on a reasonable assumption or probability: Used to describe a status, title, or right that is expected to be confirmed or realized based on current circumstances, such as lineage or law.

Examples of Usage

• Adjective:
  • The police had presumptive evidence linking him to the crime scene.
  • A presumptive diagnosis was made based on the patient's symptoms before the lab results arrived.
  • He was the presumptive heir to the throne, next in line after the king's son.

Advanced Usage

• "Presumptive nominee": In politics, a candidate who has not been formally nominated but has secured enough delegate support to make the nomination virtually certain.

  • After winning the final primary, she became the party's presumptive nominee.

• "Presumptive positive": In medicine or testing, an initial positive result that is highly indicative of a condition but requires a confirmatory test for a definitive diagnosis.

  • The rapid test yielded a presumptive positive for the virus.

Variants and Related Words

• Presumptively (adverb): In a way based on reasonable assumption.

  • The property will presumptively pass to the eldest child.

• Presumption (noun): The act of presuming; an idea that is taken to be true based on probability.

  • The argument is based on a presumption of innocence.

Synonyms

• Probable: Likely to happen or be the case.
• Assumed: Accepted as true without proof.
• Putative: Generally considered or reputed to be.

Antonyms

• Definitive: Serving to provide a final solution or answer; conclusive.
• Confirmed: Established as true or definite.

Related Phrases and Usage Notes

• Presumptive evidence: Evidence that is sufficient to establish a fact or raise a presumption of truth unless contradicted.

  • The fingerprint was considered presumptive evidence of his presence.

• Heir presumptive: A person who is expected to inherit a title or position but can be displaced by the birth of a closer heir (e.g., a younger sibling).

  • As the king's younger brother, he was the heir presumptive for many years. (Contrast with "heir apparent," which denotes an heir whose position cannot be displaced by a subsequent birth.)

Adjective

1. affording reasonable grounds for belief or acceptance
   • presumptive evidence
   • a strong presumptive case is made out
2. having a reasonable basis for belief or acceptance
   • the presumptive heir (or heir apparent)