"Effect" vs. "Affect"

These two words, with such different meanings, are frequently interchanged in writing. The problem is that they sound so similar, which causes many writers to use the wrong one. A little basic knowledge of English grammar will help you know which one to use--and why.

1. Common uses

"Effect" is most commonly used as a noun and refers to something that happens because of some action or event. A good synonym is "result." For example, pretend that you are watching a fireworks display, and one rocket makes a really big boom. The person next to you, deafened by the blast, turns to you and shouts, "That was a really great effect." That person is referring to the blast that occurred when the rocket exploded, i.e., the result of the explosion.

"Affect" is most commonly used as a verb and refers to the action of influencing something else. In fact, "influence" (the verb) is a good synonym. For example, when the person just mentioned has finished shouting about the effect, you might respond, "Yeah, it must have affected your hearing."

Here are a few more samples:
1. What will be the effect of winking at her? Will winking affect her opinion of me?
2. When she smiles at me, my whole day is affected. It's a strange effect.

2. Less common uses

""Effect" is sometimes used as a verb, though we don't like this use. It is too "new-speaky" for us, like using "dialogue" as a verb, which it isn't. When "effect" is being used as a verb, it refers to the action of causing something to occur. An example of this is: "My wink effected a change in her attitude about me."

"Affect" can be correctly used as a noun. As a noun, this refers to emotions or an emotional response. You will find many examples of this in psychology documents. An example is: "Her affect was strange when I winked at her."

3. Quick Summary

Effect: Noun, means result
Affect: Verb, means influence; Noun, means emotional response

Since so many writers mistake these two words, editors at Precise Edit usually do a search for them when editing. We examine each occurrence and make sure the correct word is being used. Correct word choice, after all, is a sign of being a professional writer.