# ROI

/ˈɹɔɪ/ (US)

Source: https://englishreference.com/word/roi
Updated: 2026-08-08

## Senses

### 1. return on investment

noun · CEFR B2 · Technical · Academic

Stands for Return on Investment. It measures how much money you make or lose on an investment compared to how much it cost.

For teachers: Abbreviation for Return on Investment. A financial ratio used to calculate the benefit an investor receives in relation to their investment cost.

- The company decided to cancel the project because the expected ROI was too low.
- Analysts are questioning the long-term ROI of the recent acquisition, given the significant integration costs and market volatility.

Usage: Usually treated as a countable noun; often preceded by 'high', 'low', or 'positive'.

### 2. Republic of Ireland

noun · CEFR B1 · Formal

Stands for Republic of Ireland. You use this to refer specifically to the country in Western Europe, rather than the whole island.

For teachers: Abbreviation for Republic of Ireland. Used to distinguish the sovereign state from Northern Ireland or the geographical island as a whole.

- The company has offices in both the UK and the ROI.
- Trade agreements between the ROI and its European partners have been restructured following recent changes in regional maritime law.

Usage: Typically used in formal, administrative, or legal contexts to ensure geographic precision.

### 3. region of interest

noun · CEFR C1 · Technical

Stands for Region of Interest. In science or photography, this is the specific part of an image or data set that you want to study.

For teachers: Abbreviation for Region of Interest. A specific subset of samples within a dataset identified for a particular purpose, common in medical imaging and computer vision.

- The software allows the doctor to highlight the ROI on the brain scan.
- The algorithm was designed to automatically detect the ROI within the satellite imagery, filtering out irrelevant environmental noise.

Usage: Commonly used in medical, engineering, and computing contexts.

## Examples

- The new marketing campaign had a very high ROI.
- Before approving the software upgrade, the board requested a detailed report on the expected ROI over the next three years.
- While the immediate ROI appeared negligible, the long-term strategic value of entering the emerging market justified the substantial upfront expenditure and initial operating losses.

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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.