immunization

IPA/ˌɪmjənaɪˈzeɪʃn/
KK[ˌɪmjunəzˈeʃən]IPA/ˌɪmjənəˈzeɪʃn/

immunization — noun

  • immunizationsingular
  • immunizationsplural

1. A medical procedure in which a human or an animal receives a vaccine so that the

1.nounB2
Definition

A medical procedure in which a human or an animal receives a vaccine so that the body's immune system can fight off a specific infectious disease without causing symptoms of that illness.

Example

The government launched a nationwide immunization program for children under five.

collocation: immunization program + target population

Travelers to tropical regions should check their immunization records before departure.

collocation: immunization records

Common collocations
  • childhood immunization
  • flu immunization
  • immunization campaign
  • immunization clinic
  • immunization program
  • immunization record
  • immunization schedule
  • routine immunization
Synonyms
  • vaccination

    Refers specifically to the act of receiving a vaccine; more concrete than immunization, which includes the body's response.

  • inoculation

    Older, more formal term; historically referred to introducing a mild form of a disease, but now overlaps with vaccination in informal usage.

  • shot

    Informal American English for a single vaccine dose; much narrower in scope.

Grammar Patterns

immunization + against + [disease]

immunization + for + [group/population]

Usage Note

Frequently used as a countable noun ('a polio immunization') when referring to a single vaccine dose or personal vaccination event. As an uncountable noun ('the spread of immunization') it describes the general medical practice or population-level protection rate. Distinguish sense 1 from the legal/figurative sense of 'immunity' (exemption from penalty), which is a different word (immunity, not immunization).

Common Mistakes

I got an immunization shot at the pharmacy.
I got a vaccination shot at the pharmacy.
'Immunization' describes the process of becoming protected, not the injection itself. 'Vaccination' is the correct term for the shot.
The politician asked for immunization from prosecution.
The politician asked for immunity from prosecution.
The legal sense of exemption requires 'immunity,' not 'immunization,' which is a medical term only.

Word family

Synonym discussion

Sense: noun/1

Immunization, vaccination, and inoculation all relate to protection against disease, but they differ in scope. Immunization is the broadest term — it covers the entire process by which a person's immune system learns to fight a disease, whether through a vaccine or natural exposure. Vaccination is narrower: it refers specifically to the act of receiving a vaccine (a shot, oral dose, or nasal spray). Inoculation is the oldest of the three, historically referring to introducing a mild form of a disease (e.g., smallpox pus) to build immunity; today it is mostly used in formal or historical contexts. 'Shot' is an informal American term for a single vaccine dose. For everyday use: 'I got my flu shot' (specific action) vs. 'Childhood immunization rates are rising' (population-level outcome).

vaccination ↗inoculation ↗shot ↗

Common collocations

Nouns

  • immunization program
  • immunization campaign
  • immunization clinic
  • immunization record
  • immunization schedule
  • immunization rate

Phrases

  • proof of immunization
  • routine childhood immunization
  • mass immunization drive

Prepositions

  • against (immunization against polio / measles)
  • for (immunization for infants / travelers)

Etymology

LatinEnglish

From 'immune' (protected from disease) + '-ization' (suffix forming nouns of process). 'Immune' traces back to Latin 'immunis', meaning 'exempt from public service' — in ancient Rome, citizens who were excused from certain civic duties. The medical sense of 'protected from disease' developed in the late 1800s as germ theory and vaccine science emerged, turning an old legal idea into a cornerstone of modern medicine.