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Technical Vocabularynoun · /ˌænəˈteɪʃən/

annotation

In simple English

In software engineering, annotations are tags or metadata that provide information about code without being part of the code logic itself. They are commonly used in Java, Python, and other languages to mark classes, methods, or fields with special instructions or metadata. For example, @Override in Java tells the compiler that a method overrides a parent class method. In data science and machine learning, annotations refer to labeling data (like marking images as 'cat' or 'dog') for training models. In documentation and code reviews, annotations are helpful notes explaining why a decision was made or flagging potential issues. Annotations help teams maintain clarity, enforce standards, and automate processes.

What annotations are in programming and how to use them in code

At a glanceCEFR B2
Commonness4/5
Versatility4/5
FormalityCasualFormalNeutral
Spoken ↔ WrittenSpokenWrittenBoth
Directness ↔ DiplomaticDirectDiplomaticDirect
RegionUS and UK
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Say it like this

Add annotations to clarify the intent
We use annotations to mark deprecated features
The dataset needs proper annotations for training

Real examples

in a standup

"We spent the morning adding annotations to the API endpoints so the team understands the expected input and output."

in a code review

"Please add an annotation here explaining why we are bypassing the standard validation logic."

in a team meeting

"Before we ship the model, we need to finish annotating the test images so we can validate accuracy."

Don't say this

Handle with care. Do not confuse with 'comment'. Annotations are metadata or labels added to code or data; comments are explanatory text. Also, annotation is typically a noun; do not use it as a verb without context.

We need to annotation the code.
We need to add annotations to the code.Annotation is a noun, not a verb. Use 'add annotations' instead of 'annotation' as a verb.
The comment tells the compiler what to do with this method.
The annotation tells the compiler what to do with this method.Comments are for human readers; annotations are metadata that instruct the compiler or runtime.
We have too many annotations, so let us remove them all.
We have too many annotations, so let us clean up the unnecessary ones.Annotations serve a purpose; removing all of them can reduce code clarity.

Other forms

noun

annotation

"The annotation @Deprecated marks methods that should no longer be used."

noun (plural)

annotations

"Adding annotations improves code readability and maintainability."

adjective

annotated

"The annotated dataset is ready for machine learning training."

Often used with

add annotationsUsed when you are including annotations to code or data
annotation syntaxRefers to the specific format or rules for writing annotations in a language
code annotationAnnotations specifically applied to source code
data annotationLabeling or marking data for machine learning or analysis
remove annotationsTaking out annotations that are no longer needed

Similar words

metadataBroader term for information about information; annotations are a type of metadata
labelSimpler term, often used in data science; less specific than annotation
tagMore general term for marking something; annotation is more formal in programming

Opposites

uncommented codeunlabeled data

Practice

Try it

4 quick exercises

Complete the sentence

1. The _______ on that method tells the compiler it overrides a parent class method.

Pick the most natural phrasing

2. What would a senior developer most likely say?

Spot the mistake

3. Which sentence uses annotation incorrectly?

Rewrite naturally

4. Rewrite this in natural tech English: We put notes on the code that tell the system what to do without changing how the code works.

Questions

Quick poll

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