What does the prefix intra- mean?
Intra- comes from the Latin intra, which means "within" or "inside". It shows that something happens or is found within the limits of something: a body, a cell or an organization.
ESEN
Prefix · within / inside
intra-
Signals within or inside a single entity: intravenous, intranet, intramural, intracellular.
Literary
Written by Bryan López, English teacher · Updated
Intra- or inter-: within or between
They are easy to confuse, but the difference is simple. Intra- is "within" one group; inter- is "between" several groups. Sports within a single university are intra-, and tournaments between different universities are inter-. An intravenous injection goes inside the vein; an intercontinental flight goes between continents. A single letter completely changes the meaning.
How it is used
Attaches to technical, medical, and administrative nouns:
- intra- + organ/cell (medical)venous → intravenouscellular → intracellularmuscular → intramuscularnasal → intranasal
- intra- + institution/spacemural → intramuralnet → intranetpersonal → intrapersonaldepartmental → intradepartmental
Pronunciation: /ˈɪntrə/. Do not confuse with inter- (= between). Key distinction: intra- = within a single group; inter- = between multiple groups.
How it is pronounced
intra-/ˈɪntrə/
Tap the button to hear how the prefix sounds. Each word in the table has its own audio.
Examples
Root word
With intra-
In a phrase
- venousintravenousThe nurse gave the antibiotics intravenously, directly into a vein.
- netintranetThe company intranet lets staff share documents securely inside the organisation.
- muralintramuralThe university offers intramural sports for students who want low-key competition.
- cellularintracellularViruses hijack intracellular machinery to copy themselves inside the host cell.
- muscularintramuscularThe vaccine was an intramuscular injection into the upper arm.
- personalintrapersonalStrong intrapersonal skills like self-awareness support better relationships with others.
- nasalintranasalThe intranasal spray delivers medicine through the nose for rapid absorption.
Common mistakes
intranet and internet are the same
internet = a global public network accessible from anywhere; intranet = a private network operating only within a specific organisation
"Internet" (inter- = between): the global network connecting all networks worldwide, publicly accessible. "Intranet" (intra- = within): a private network using internet technology but accessible only within a specific organisation (a company, a university). An intranet may look like the internet but is closed to outsiders.
intrapersonal = between people / interpersonal
intrapersonal = within a single person (internal mental processes); interpersonal = between different people (external relationships)
"Intrapersonal" (intra- = within): occurring inside one person's mind — intrapersonal conflict, intrapersonal intelligence, self-awareness. "Interpersonal" (inter- = between): occurring between people — interpersonal skills, interpersonal relationships. Intra- = inside one person; inter- = between multiple people.
A trick to remember it
Picture something happening inside a single building, never leaving: intra- = inside one thing (unlike inter-, which is between several). intravenous.
Practise what you learned
Exercise 1 · Form the word
Exercise 2 · Pick the right one
"The company's ___ allows staff to share documents securely without exposing sensitive data to the public internet."
Exercise 3 · Pick the right one
What is the difference between "intrapersonal" and "interpersonal"?
Frequently asked questions
What does the prefix intra- mean in English?
The prefix intra- signals within or inside a single entity: intravenous, intranet, intramural, intracellular.
How do you pronounce intra-?
The prefix intra- is pronounced /ˈɪntrə/. For example, "intravenous".
Can you give an example of a word with intra-?
"venous" becomes "intravenous". It is a typical example of the intra- prefix.
Other useful prefixes
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