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Preposition before noun

Core with different prepositions

Core is most commonly used with of and to. Other prepositions may appear when core is part of a larger phrase or has a technical meaning.

Quick answer

Which prepositions are used with core?

The most common combinations are core of for the central part of something and core to for something essential. In the core refers to location inside a central area. With core and on core are usually part of wider technical or descriptive phrases rather than fixed combinations.

Trust is at the core of the partnership.
Safety is core to the company's values.
Heat builds up in the core of the reactor.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
core of + thing

Referring to the central part

Use core of to describe the most important or central part of something.

Innovation is the core of the strategy.
The debate reached the core of the issue quickly.
2
core to + system or idea

Showing essential importance

Core to means essential or fundamental to something.

Research is core to the programme.
Clear communication is core to effective leadership.
3
in the core

Describing location inside a centre

In the core refers to being inside the central area of something physical or abstract.

Temperatures rise in the core of the planet.
The problem lies in the core of the system.
4
with core + noun

Using core as an adjective-like modifier

With core is not a fixed pattern after the noun core. It usually appears in wider phrases describing features or components.

The processor comes with core security features included.
The package ships with core modules already installed.
5
on-core

Technical compound uses

On core appears mainly in technical writing as part of compound expressions such as on-core memory or on-core processing.

The system relies on on-core processing for speed.
Researchers compared on-core memory with external storage.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
core of
This principle is at the core of the policy.
Refers to the central or most important part.
core to
Accuracy is core to the company's reputation.
Means essential or fundamental to something.
in the core
Pressure increases in the core of the engine.
Refers to location inside a central area.
with core
The software ships with core functions enabled.
With introduces accompanying features; it is not a fixed phrase with the noun core.
on core
The manual describes on-core processing methods.
Mainly used in technical compound expressions.

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using core to for physical centres

Core to expresses importance, not physical location.

✕ The damage was core to the reactor. ✓ The damage was in the core of the reactor.

Confusing core of with core to

Core of identifies a central part, while core to means essential.

✕ Trust is core of leadership. ✓ Trust is core to leadership.

Treating with core as a fixed collocation

With usually introduces accompanying items rather than directly combining with core.

✕ The theory is with core economics. ✓ The theory focuses on core economics.

Using on core in general English

On core is mostly technical and uncommon in everyday language.

✕ The discussion was on core values. ✓ The discussion was about core values.

Quick practice

Choose the expression that matches the intended meaning.

1. Trust is at the core ___ the organisation.
2. Safety is core ___ our training programme.
3. Temperatures increase ___ the core of the planet.

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Frequently asked questions

Is core to grammatically correct?

Yes. Core to is standard when something is essential or fundamental to another thing.

Can I say core of?

Yes. Core of is very common for the central or most important part of something.

Is on core common in everyday English?

No. On core mainly appears in technical compound expressions rather than general conversation.

of, about, against, to or for racism? of, about, for, in or on friendship? of, about, for, on or to thing? of, about, for, to or with sex? of, about, on, to or for moon? "of access" or "with access"? "of accommodation" or "for accommodation"? "of accuracy" or "for accuracy"? "of action" or "in action"? "of actor", "with actor" or "by actor"? "of address" or "to address"? "of administration" or "in administration"?

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