master key

USAGE SUMMARY

'master key' is correct and usable in written English.
You can use the expression 'master key' when referring to a key that can open any lock, figuratively or literally. For example: "He held the power of the master key - the key that could open up any door."

✓ Grammatically correct

Academia

News & Media

Science

Wiki

Encyclopedias

Human-verified examples from authoritative sources

Exact Expressions

56 human-written examples

Master key rollover support, making it easier to change master key passwords or encryption types.

Massachusetts Institute of Technology

The ultimate master key.

The Guardian - Books

Then I got out the master key.

The New York Times

Cubism is artistic modernity's master key.

The New Yorker

Enter KDC database master key: <= Enter the database master key.

Massachusetts Institute of Technology

prompts for a new master key.

Massachusetts Institute of Technology

There are no limitations when the master key is used.

The New York Times

Human-verified similar examples from authoritative sources

Similar Expressions

4 human-written examples

This has been changed and now reads, "The Master-Key to the News".

The New Yorker

PasswordBox is new app for managing passwords with 'master' key.

Los Angeles Times

SIM Digital, Los Angeles, acquired the finishing division of Master Key, Los Angeles, a postproduction company.

The New York Times

WiFi Master Key has not responded to emailed questions about its security practices.

TechCrunch

Expert writing Tips

Best practice

Employ the phrase metaphorically to describe a concept, theory, or tool that provides a solution to a complex problem (e.g., 'the master key to youth').

Common error

Avoid using "master key" as a verb (e.g., 'to master key the locks'). Instead, use 'to create a master key' or 'to re-key for a master system'. Similarly, do not confuse it with 'key master', which refers to a person rather than an object.

Linguistic Context

The phrase "master key" functions primarily as a compound noun where 'master' acts as an attributive noun modifying 'key'. According to Ludwig AI, it is almost always used to designate a specific object or a digital credential that holds superior access rights over others in a system.

Expression frequency: Very common

Frequent in

Science

35%

News & Media

30%

Academia

25%

Less common in

Wiki

5%

Encyclopedias

3%

Social Media

2%

Ludwig's WRAP-UP

The phrase "master key" is a versatile and highly common English expression that spans multiple domains. Ludwig AI demonstrates its prevalence in both literal applications—such as hotel maintenance and locksmithing—and digital environments like the Kerberos database and cryptography. Beyond its physical meaning, it serves as a robust metaphor for any essential concept that unlocks understanding or provides a solution to a multifaceted problem. With over 50 exact matches in high-authority sources, users can confidently use it in professional, academic, and creative writing to signify unrestricted access or a singular solution. It is consistently used as two words and remains a staple in discussions regarding security, architecture, and philosophy.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

passkey

Acts as a direct synonym for a physical key that opens multiple locks.

skeleton key

Refers specifically to a key designed to open many different warded locks by having most of its bit removed.

passe-partout

Provides a more formal or European-flavored synonym for a master key.

universal key

Emphasizes the literal or metaphorical ability to unlock anything.

overriding key

Highlights the functional priority of the key over standard user keys.

golden key

Used primarily in metaphorical contexts to describe a valuable solution or secret.

all-access key

Shifts focus to the breadth of access granted by the object.

primary key

Specific to database management and cryptography, representing a unique identifier.

central key

Suggests a key that is at the core of a system's structure.

main key

A simpler, more generic way to describe the most important key in a set.

FAQs

How to use "master key" in a sentence?

You can use "master key" to describe an object that opens many doors, such as: 'The janitor carried a "master key" that gave him access to every classroom in the school'.

What can I say instead of "master key"?

Depending on the context, you can use alternatives like "passkey", "skeleton key", or "universal key".

Is it "master key" or "masterkey"?

The standard English spelling is two separate words: "master key". While some technical systems might combine them as a variable name (like 'masterkey'), in general writing, the two-word version is correct.

What is the difference between "master key" and "skeleton key"?

While often used interchangeably, a "master key" is part of a designed hierarchy of locks, whereas a "skeleton key" is a key with a thin bit that bypasses the wards of many different old-fashioned locks.