Prefix · intensity · down/against
Means "down," "against," or "completely": catastrophe, catalyst, catalog, cataclysm, catapult.
Written by Bryan López, English teacher · Updated
Cata- comes from Greek "kata" (down, against, completely, throughout) and appears in some of the most vivid words in English: catastrophe = a turning/twisting downward (a disaster); catalyst = something that loosens or breaks down energy barriers; cataclysm = a violent washing-down or flooding; catapult = a hurling downward/away; cataract = a rushing downward of water; catacomb = vaulted-down underground chambers.
Despite its Greek origin, cata- vocabulary is widely used: catastrophe (any major disaster), catalyst (any trigger for change), catalog (a complete list, "going through everything"), catapult (any sudden launching force). In chemistry, a catalyst lowers activation energy — it speeds up a reaction "by going through" the energy barrier without being consumed. The figurative extensions are common in journalism and everyday speech.
Attaches to Greek roots to signal downward direction, opposition, or thorough action:
Pronunciation: /ˈkætə/. The variant cat- appears before vowels: cataract, catacomb, catalogue. Spanish cognates: catastrophe/catástrofe, catalyst/catalizador, catalog/catálogo, cataclysm/cataclismo, catapult/catapulta, cataract/catarata.
cata-/ˈkætə/
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"Cata-" and "cat-" are the same Greek root "kata." Before consonants: cata- (catastrophe, catalyst, catapult). Before vowels: cat- (cataract, catacomb, catalogue). The same phonological rule operates in other Greek-derived prefixes. Once you know it is always cata-, the vocabulary group becomes much more recognisable.
A trick to remember it
Cata- = down, against, completely. Spanish cognates: catastrophe/catástrofe, catalyst/catalizador, catalog/catálogo, cataclysm/cataclismo, catapult/catapulta. Once you recognise cata-, a whole cluster of expressive vocabulary becomes transparent.
Exercise 1 · Form the word
Exercise 2 · Pick the right one
What does "cataclysm" mean?
The prefix cata- means "down," "against," or "completely": catastrophe, catalyst, catalog, cataclysm, catapult. In Spanish it usually maps to cata-.
The prefix cata- is pronounced /ˈkætə/. For example, "catastrophe".
"strophe" becomes "catastrophe". It is a typical example of the cata- prefix.
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