# HIV

/ˈeɪˈtʃaɪˈvi/ (US)

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

## Senses

### 1. the virus

noun · CEFR B2

Stands for Human Immunodeficiency Virus. This virus attacks the cells that help the body fight infections.

For teachers: Abbreviation for Human Immunodeficiency Virus. A lentivirus that causes HIV infection and over time acquired immunodeficiency syndrome (AIDS).

- Modern medicine allows people living with HIV to lead long and healthy lives.
- Public health initiatives have focused on increasing access to testing and antiretroviral therapy to reduce the transmission of HIV within the community.

Usage: Usually used as an uncountable noun without an article when referring to the condition or virus generally.

Teaching tip: Learners should distinguish between HIV (the virus) and AIDS (the late-stage syndrome caused by the virus).

### 2. isolation valve

noun · CEFR C2 · Technical

A special valve used in engineering to stop the flow of liquids or gases in a pipe.

For teachers: Abbreviation for Header, Helium, or Hydraulic Isolation Valve. A safety or maintenance component designed to stop the flow of process fluid in a piping system.

- The technician checked the HIV to ensure no gas was leaking into the main chamber.
- During the pre-flight checklist, the engineers verified that the helium isolation valve (HIV) was responding correctly to the remote command.

Usage: In this technical sense, it is a countable noun and often takes an article.

Teaching tip: This sense is highly specialized; unless teaching students in aerospace or fluid engineering, focus on the medical sense.

## Examples

- Modern medicine helps people live long lives with HIV.
- Regular testing for HIV is a vital part of public health strategies to prevent the spread of the virus.
- The development of antiretroviral therapy has transformed HIV from a terminal diagnosis into a manageable chronic condition for those with access to consistent healthcare.

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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.