Unit 7.1

Prefixes and hyphens


Prefixes can be added before a word with or without a hyphen.


  • Structure:

Prefix + hyphen (-) + word

  • This is the list of all the prefxes that admit a hyphen:
anti bi co
contra counter de
extra infra inter
intra micro mid
multi non over
peri post pre
pro proto pseudo
re semi sub
super supra trans
tri ultra un
under whole
  • To choose whether to add the hyphen or not you have to keep in mind that the hyphen often changes the meaning of the new word that you form.


  • Re-read
  • Non-binary
  • Extra-cheese
  • Pseudo-science


We hyphen in order to avoid confusion with other words with different meanings and to make the text more precise.