Prefix · within / inside
Signals within or inside a single entity: intravenous, intranet, intramural, intracellular.
Written by Bryan López, English teacher · Updated
Intra- comes from Latin "intra" (within, inside) and signals that something occurs or exists within the boundaries of something: intravenous = going inside a vein (administering medication directly into the bloodstream); intranet = a computing network operating only within an organisation; intramural = occurring within the walls (of a university or institution); intracellular = found or occurring within a cell.
Intra- and inter- are easily confused: intra- = within (a single group or entity); inter- = between (multiple groups or entities). "Intramural" = sports within the same university (between teams from the same institution). "Intercollegiate" = between different universities. "Intravenous" = within the vein. "Intercontinental" = between continents. The distinction "within one" vs "between many" is the key.
Attaches to technical, medical, and administrative nouns. Identical in Spanish and English:
Pronunciation: /ˈɪntrə/. Identical in Spanish and English. Do not confuse with inter- (= between). Key distinction: intra- = within a single group; inter- = between multiple groups.
intra-/ˈɪntrə/
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"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" (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
Intra- = "within" or "inside": intravenous = within the vein, intranet = network within an organisation, intramural = within the same institution, intracellular = within the cell. Identical in Spanish. Key contrast with inter-: "intramural" (within one school) vs "interscholastic" (between different schools).
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"?
The prefix intra- signals within or inside a single entity: intravenous, intranet, intramural, intracellular. In Spanish it usually maps to intra-.
The prefix intra- is pronounced /ˈɪntrə/. For example, "intravenous".
"venous" becomes "intravenous". It is a typical example of the intra- prefix.
un-, re-, pre-, dis-, over-, in-... every beginning you need to unlock thousands of English words at once.