the central stone at the summit of an arch, locking the whole together, a central principle or part of a policy, system, etc., on which all else depends

Formal and Informal Expressions of keystone

In different contexts, you can replace 'keystone' with suitable alternatives. In a more formal setting, 'centerpiece, foundation, linchpin' is apt. In informal speech or writing, 'mainstay, cornerstone' is a commonplace synonym.

keystone: Explore its Definition & Usage

keystone Definition

1the central stone at the summit of an arch, locking the whole together
2a central principle or part of a policy, system, etc., on which all else depends

Using keystone: Examples

Take a moment to familiarize yourself with how "keystone" can be used in various situations through the following examples!

Example
The keystone of the bridge was carefully placed.
Example
The keystone of his argument was that the company needed to focus on innovation.
Example
The keystone species in this ecosystem is the beaver.

keystone Synonyms and Antonyms

Synonyms for keystone

Phrases with keystone

keystone habit
a habit that has a positive ripple effect on other areas of one's life
Example
Exercising regularly is often considered a keystone habit that can lead to better sleep, improved mood, and increased productivity.
keystone species
a species that plays a crucial role in maintaining the balance of an ecosystem
Example
The sea otter is a keystone species in the kelp forest ecosystem, as it helps control the population of sea urchins, which would otherwise overgraze the kelp.
keystone pipeline
a pipeline system that transports crude oil from Canada to the United States
Example
The Keystone Pipeline has been a controversial issue due to concerns about its environmental impact.

Origins of keystone

from Old English 'cēapstān', meaning 'buying stone'

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Summary: keystone in Brief

The term 'keystone' [ˈkiːstəʊn] refers to the central stone at the top of an arch that locks the structure together. It also denotes a central principle or part of a policy, system, etc., on which all else depends. Examples include 'The keystone of the bridge was carefully placed.' and 'The keystone species in this ecosystem is the beaver.' 'Keystone' extends into phrases like 'keystone habit,' referring to habits with positive ripple effects, and 'keystone pipeline,' a pipeline system transporting crude oil from Canada to the United States.