IELTS Academic Vocabulary: Words for a Higher Band

substantiate verb

To provide evidence that proves the truth of a claim or accusation.

The author fails to substantiate the assertion that automation reduces long-term employment.

corroborate verb

To confirm or give support to a statement, theory, or finding with additional evidence.

The interview data corroborate the patterns observed in the survey responses.

underpin verb

To provide the theoretical or evidential foundation on which something rests.

A constructivist view of learning underpins the whole of the study's design.

posit verb

To put forward an idea or assumption as a basis for argument or investigation.

The theory posits that early exposure to a second language reshapes cognitive control.

delineate verb

To describe or set out something precisely, especially the boundaries or scope of a topic.

This section delineates the theoretical framework that underpins the analysis.

elucidate verb

To make something clear by explaining it more fully.

The following case study elucidates the mechanism proposed in the previous section.

preclude verb

To prevent something from happening or make it impossible.

The cross-sectional design precludes any firm claims about causation.

warrant verb

To justify or provide sufficient grounds for a particular course of action or conclusion.

The inconsistency in these results warrants further investigation.

albeit conjunction

Although, used to introduce a concise concessive qualification within a sentence.

The intervention produced a positive effect, albeit a modest one, across all three cohorts.

notwithstanding preposition

In spite of the thing just mentioned, used in formal writing to concede a point without abandoning the argument.

Notwithstanding these limitations, the findings offer a useful starting point for further enquiry.

tentatively adverb

In a cautious, provisional way that leaves room for revision as more evidence emerges.

We tentatively conclude that the correlation reflects a causal link, pending replication.

it could be argued that phrase

A hedging construction used to advance a claim while distancing the writer from full commitment to it.

It could be argued that economic factors, rather than cultural ones, drove the decline.

to a certain extent phrase

A hedging phrase indicating that a statement is only partly true or applicable.

To a certain extent, the model accounts for the anomalies, but several remain unexplained.

by and large phrase

On the whole, used to make a cautious generalisation that admits minor exceptions.

By and large, the literature supports a positive link between exercise and cognitive function.

ostensibly adverb

As it appears on the surface, often implying that the reality may differ from the stated reason.

The reform was ostensibly about efficiency, though its effects were largely political.

paucity noun

The presence of something in insufficient quantity, often used to justify new research.

There is a marked paucity of longitudinal data on the condition in adolescents.

dearth noun

A scarcity or lack of something, frequently cited when identifying a gap in the literature.

Despite widespread interest, there remains a dearth of empirical work on the topic.

crux noun

The most important or central point of a problem or argument.

The crux of the debate lies in how one defines welfare in the first place.

caveat noun

A warning or qualification that limits how a claim or result should be interpreted.

These conclusions come with the caveat that the sample was drawn from a single institution.

notion noun

A concept or idea, often one being critically examined rather than endorsed.

This paper interrogates the notion that intelligence can be captured by a single measure.

discrepancy noun

A difference or inconsistency between two things that should match.

There was a discrepancy between the invoice and the delivery note.

scope noun

The range of subject matter that a piece of work addresses or deliberately excludes.

A detailed treatment of pricing lies beyond the scope of the present essay.

salient adjective

Most noticeable or important, used to single out the key features of a phenomenon.

The most salient finding is the sharp divergence between self-reported and observed behaviour.

pertinent adjective

Directly relevant to the matter under discussion.

The review is confined to studies pertinent to the central research question.

compelling adjective

So convincing or interesting that it holds one's attention or forces agreement.

She made a compelling case for relocating the head office.

viable adjective

Capable of working successfully or being done in a practical way.

Solar power is now a commercially viable alternative for the plant.

meticulous adjective

Showing great attention to detail and care over accuracy.

Her meticulous record-keeping made the audit remarkably straightforward.

pragmatic adjective

Dealing with problems in a sensible, practical way rather than by theory.

We need a pragmatic solution that we can actually implement this quarter.

tentative adjective

Not certain or fixed; done cautiously or provisionally.

We reached a tentative agreement, subject to approval by the board.