# PhD

/ˈpiˌeɪtʃˈdi/ (US) · CEFR C1 · Noun

Source: https://englishreference.com/word/phd
Updated: 2026-05-02

## Definition

the highest degree you can earn from a university. It shows that you have done original research and are an expert in your subject.

For teachers: the highest academic degree awarded by a university, typically requiring several years of original research and the successful defense of a thesis. Often used as a title for those who have completed a doctoral program.

## Examples

- She is studying hard to finish her PhD.
- After five years of intensive research in the laboratory, he finally submitted his PhD thesis for review.
- While a master's degree provides specialized knowledge, a PhD requires the candidate to make a significant and original contribution to their field through rigorous academic inquiry.

## Pitfalls

- Not "She is a PhD." but "She has a PhD." — The word refers to the degree itself, not the person who holds it; use 'has' or 'is a PhD student'.

## Usage notes

- Often used with the verb 'to hold' or 'to earn'. When used as a title, it follows the person's name, usually separated by a comma.

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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.