SOLID

What Does SOLID Mean?

The Quick Answer

SOLID means "dependable" or "stupid."

More Detail...

It is also an acronym for five principles of software design.

Dependable

The word solid is widely used as a slang term, meaning "dependable" or reliable. For example:

• Ali and Jo are solid. They'll watch your back.

Stupid

Especially in the UK, solid is also used to mean "stupid." For example:

• Ali and Jo are solid. You can blame everything on them.

Software Design Principles

In software design and development, SOLID is an acronym that stands for five key design principles used by software engineers:

• S - Single-responsibility principle.
• O - Open-closed principle.
• L - Liskov substitution principle.
• I - Interface segregation principle.
• D - Dependency inversion principle.

The SOLID principles were developed in an essay published in 2000, by American software engineer, instructor, and author Robert C. Martin, titled "Design Principles and Design Patterns."

Image for SOLID

When I write SOLID, I mean this:

"Dependable"

Summary of Key Points for the First Definition

"Dependable" is, by far, the most common meaning for SOLID when it is used in a text. (Bear in mind that it could have another meaning if used in a different context.)

SOLID
Definition:	Dependable
Type:	Word
Guessability:	2: Quite easy to guess
Typical Users:	Adults and Teenagers

Summary of Key Points for the Second Definition

"Stupid" is another definition for SOLID, especially in the UK.

SOLID
Definition:	Stupid
Type:	Word
Guessability:	2: Quite easy to guess
Typical Users:	Adults and Teenagers

Summary of Key Points for the Third Definition

SOLID is also an acronym for five key software design principles.

SOLID
Definition:	Software Design Principles
Type:	Acronym
Guessability:	5: Extremely difficult to guess
Typical Users:	Specialists

Example of SOLID Used in a Text

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