# Vega

/ˈveɪɡə/ (US)

Source: https://englishreference.com/word/vega
Updated: 2026-08-15

## Senses

### 1. the star

noun · CEFR B2

the brightest star in the constellation Lyra, often seen in the summer sky.

For teachers: the brightest star in the constellation Lyra and the fifth-brightest star in the night sky. Often used as a reference point in astronomy.

- On a clear summer night, you can easily spot Vega high in the sky.
- Astronomers often use Vega as a baseline for the magnitude scale because of its consistent brightness and proximity to Earth.

### 2. finance risk measure

noun · CEFR C2 · Technical

a technical term used to measure how much an option's price changes when market volatility moves.

For teachers: a first-order derivative of an option's value with respect to the volatility of the underlying asset. It represents the sensitivity of the price to changes in implied volatility.

- The trader checked the vega of his portfolio to see how a sudden market swing might affect his profits.
- When implied volatility spikes, options with high vega experience significant price appreciation, regardless of the direction of the underlying stock's movement.

Usage: Usually treated as an uncountable noun in financial contexts; often grouped with other 'Greeks' like delta and gamma.

### 3. fertile plain

noun · CEFR C2 · Dialect

a flat, fertile piece of land, especially one used for growing tobacco.

For teachers: a fertile, moist tract of land or a meadow, particularly in Spanish-speaking regions or the Philippines. Often associated with tobacco cultivation.

- The farmers worked in the lush vega where the soil was perfect for their crops.
- The valley was characterized by a broad vega that provided the local community with exceptionally rich soil for seasonal agriculture.

## Examples

- The trader checked the vega of his portfolio before the news release.
- Because the portfolio had high positive vega, the investor stood to profit significantly if market uncertainty increased.
- Institutional traders often hedge their vega exposure to ensure that sudden spikes in market turbulence do not disproportionately erode the extrinsic value of their long option positions.

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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.