Prefix · quantity · both
Means "both" or "on both sides": ambidextrous, ambiguous, ambivalent, ambiguity, ambivert.
Written by Bryan López, English teacher · Updated
Ambi- comes from Latin "ambo" (both, the two) and signals duality or presence on both sides. Ambidextrous = skilled with both hands; ambiguous = going both ways (two possible interpretations); ambivalent = feeling both opposites at once. Spanish equivalent "ambi-": ambidiestro, ambiguo, ambivalente. The Latin root "ambo" appears directly in Spanish as "ambos/ambas".
Ambi- expresses duality consistently: always two sides, two options, two feelings. "Ambiguous" means something has at least two possible readings. "Ambivalent" means experiencing two opposite emotions simultaneously. "Ambidextrous" means using both hands equally well. The prefix is especially useful for describing uncertainty, tension, or two-sidedness.
Combines with Latin and Greek roots to express duality or both-sided presence:
Pronunciation: /ˈæm.bɪ/. Spanish cognates: ambidiestro (ambidextrous), ambiguo (ambiguous), ambivalente (ambivalent), ambigüedad (ambiguity), ambivalencia (ambivalence). The Latin root "ambo" (both) appears directly in Spanish as "ambos/ambas".
ambi-/ˈæm.bɪ/
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Both use ambi- but apply differently: "The instructions are ambiguous" (the text can be read two ways). "I feel ambivalent about the promotion" (I feel excited and worried simultaneously). "Ambiguous" describes things; "ambivalent" describes how a person feels.
A trick to remember it
Ambi- = both, two sides. Spanish cognates: ambidiestro (ambidextrous), ambiguo (ambiguous), ambivalente (ambivalent), ambigüedad (ambiguity). Rule: ambi- always signals duality — two possibilities, two sides, or both at once.
Exercise 1 · Form the word
Exercise 2 · Pick the right one
If an instruction is "ambiguous", it means...
The prefix ambi- means "both" or "on both sides": ambidextrous, ambiguous, ambivalent, ambiguity, ambivert. In Spanish it usually maps to ambi-.
The prefix ambi- is pronounced /ˈæm.bɪ/. For example, "ambidextrous".
"dextrous" becomes "ambidextrous". It is a typical example of the ambi- prefix.
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