Standard Lemma guide

investigational

adj · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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CMU ARPABET: IH2 N V EH0 S T IH0 G EY1 SH AH0 N AH0 L Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.

adj

Meaning 1

Of, or relating to investigating, or to an investigation.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

adj

Meaning 2

of, or relating to an unapproved drug or chemical entity being studied.

Definition source: English Wiktionary via Wiktextract

Usage: not-comparable

Topics: medicine, sciences

Examples

An expanded access protocol allows patients to benefit from an investigational drug prior to FDA approval.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

History

Etymology

Etymology tree Middle English investigacioun English investigation English -al English investigational From investigation + -al.

Word forms

Inflections and variants

No separate word forms were provided.

Word family

Derived and related words

Derived: investigationally, noninvestigational

Related: none provided

Semantic map

Other relationships

Sources

Where this information comes from

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Real reading context

Meaning relationships

Examples

Meaning relationships

investigational in complete knowledge articles