Prefixes
- Details
- Parent Category: Advanced Skill Builders
- Category: Advanced Skill Builders: Grammar
- Written by Chris Cotter
What are prefixes?
Prefixes are groups of letters added before a word, which then creates new words. For example:
biannual - "bi" means twice, so the new meaning is "twice a year"
distrust - "dis" means not, so the new meaning is "not to trust"
submarine - "sub" means under, so the new meaning is "under water"
There are many prefixes in English, some of which are quite common and some of which are used less frequently. In some cases, the same prefix may have more than one meaning, too. If you learn prefixes, your ability to comprehend new words will greatly improve. Unfortunately, it comes down to memorization.
Here's a list of many prefixes. The ones marked with the following symbol (O) are more often used, and should perhaps be studied first.
anti-
against; opposite from/to
anti-aging anti-bacterial anti-viral
Some anti-aging skin creams can get quite pricey.
bi-
twice; to
biannual biplane bipolar
The top sales reps have a biannual meeting in sunny Puerto Rico.
circum-
around; round about
circumlocution circumnavigate
It's always been a dream of mine to circumnavigate the globe in a sailboat.
de-
opposite; reverse
decompose defrag demystify
The news program really demystified the race for the US Presidency.
O dis-
not; opposite from/of
disagree disappear disconnect
As the stock market tumbled, my savings disappeared!
en- or em-
into; make into; put into; within
entitled embed empower
Bob felt empowered the day of his promotion, and strutted around the office.
ex-
former
ex-boss ex-colleague ex-wife
My ex-boss couldn't didn't have a clue. He was incompetent!
fore-
before; front; in front of
forefront forerunner foretell
The old lady could foretell when and where a person would die.
O il- or ir-
not; opposite from/of; without
illogical irresponsible irretrievable
Drinking and driving is pretty irresponsible, don't you think?
in- or im-
in; into
import impale imperil
I had to pay an import tax on some of my presents that I bought in Guam!
O in- or im-
not; opposite from/of; without
immortal immovable intolerable
The current work environment has become completely intolerable.
inter-
among; between; in the midst of
interact international interstate
My younger brother has trouble interacting with people.
mid-
middle
midlife midseason midterm
I had my first midlife crisis when I was in my early forties.
O mis-
bad; failure; wrong
misdirect misspell mistake
There are a few words I always seem to misspell.
mono-
alone; one; single
monochrome monologue monorail
Seattle's public transportation system includes a monorail.
O non-
absence; lack of; not
nonexistent nonsense nonsmoker
The speech given by the professor seemed like a lot of nonsense to me.
O over-
excessive; too much
overachiever overdo overreact
My boss completely overreacted when I said the report would be late.
post-
after; later
postgame postmortem posttest
There is a posttest at the end of every chapter in the textbook.
pre-
before; earlier; prior to
premade preorder preview
I love watching the previews at the theater before the movie begins.
O re-
again
reassess reemploy reinvigorate
After the initial data was analyzed, we needed to reassess our initial project deadline.
semi-
half; partially
semicircle semidarkness semipro
It was difficult to see in the semidarkness of dusk.
O sub-
below; under
submarine subpar substandard
My philosopher is you get what you pay for, as a cheap product is often substandard.
super-
above or beyond normal
supernatural superpower super-size
I've often dreamed that I was a comic book hero with superpowers.
tri-
three
triangle tricolor tricycle
I bought my daughter, who just turned two last week, a tricycle for her birthday.
trans-
across; on the other side
transatlantic transcontinental transoceanic
It used to be quite difficult to make transatlantic phone calls.
O un-
not; opposite from/of
unaware unsure unused
Because I left China as a child, I'm pretty unused to speaking Chinese all day.
under-
beneath or below in position
underachiever underpass underwear
My son seems to be an underachiever, as he is quite happy to get Cs and Ds in his classes.