# milestone

/ˈmaɪɫˌstoʊn/ (US) · /mˈaɪlstəʊn/ (UK)

Source: https://englishreference.com/word/milestone
Updated: 2026-06-20

## Senses

### 1. important event

noun · CEFR B2

an important event or stage in the development of something, like a person's life or a project.

For teachers: a significant stage or event in the development of something; often used metaphorically for personal, historical, or professional progress.

- Learning to walk is a major milestone in a baby's development.
- The signing of the peace treaty represented a significant milestone in the diplomatic relations between the two neighbouring countries.

### 3. to plan steps

verb · CEFR C1 · Academic · Technical

to plan a project by breaking it into several big, important steps.

For teachers: to schedule or structure a project according to a series of specific, measurable goals or stages.

- We need to milestone the software update to ensure we finish on time.
- The project manager decided to milestone the development phase to provide the stakeholders with clear evidence of incremental progress.

Usage: often used in project management contexts

## Examples

- Reaching one million users was a huge milestone for the startup.
- The discovery of fire was a major milestone in the history of human civilization.
- While the initial prototype was successful, the team recognized that securing regulatory approval would be the most challenging milestone in the product's lifecycle.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.