# baseline

/ˈbeɪˌsɫaɪn/ (US) · /bˈeɪslaɪn/ (UK)

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

## Senses

### 1. a starting point

noun · CEFR B2 · Academic

a starting point or standard used to compare other things.

For teachers: a datum or standard used as a basis for calculation, comparison, or measurement.

- We need to establish a baseline for his health before we start the new treatment.
- The researchers established a baseline by measuring the participants' heart rates while at rest before introducing any external stressors.

Usage: Often used with the verbs 'establish', 'set', or 'provide'.

### 2. software/project management

noun · CEFR C1 · Technical

a fixed version of a project or software that is used as a reference point.

For teachers: a documented configuration of a product or process at a specific point in time, used as a reference for future changes.

- The team saved the current code as a baseline before adding new features.
- Once the requirements were finalised, the project manager set the baseline to ensure that any subsequent scope creep could be accurately tracked.

### 3. sports boundary

noun · CEFR B1

the line at the very back of a sports court, like in tennis.

For teachers: the line at the farthest ends of a court indicating the boundary of the field of play.

- The tennis player stood behind the baseline to serve the ball.
- The ball landed just inside the baseline, catching the opponent off guard and securing the final point of the set.

### 4. typography

noun · CEFR C2 · Technical

the invisible line that letters sit on when you write.

For teachers: the imaginary line upon which most characters in a typeface rest and below which descenders extend.

- The designer adjusted the baseline to make the text easier to read.
- In professional typesetting, maintaining a consistent baseline across columns is essential for a clean and balanced page layout.

### 5. to set a standard

verb · CEFR C1 · Academic · Technical

to measure something at the start so you can see changes later.

For teachers: to provide or establish a baseline for future measurement or comparison.

- It is important to baseline the system performance before the upgrade.
- The engineering team spent a week baselining the existing infrastructure to quantify the efficiency gains promised by the new hardware.

## Examples

- We need a baseline to see if the new diet works.
- The researchers established a baseline of heart rates before the participants began the high-intensity exercise program.
- Without a clear baseline of the system's performance under normal conditions, it is impossible to determine whether the recent software update has caused the observed latency issues.

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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.