Defining a word with the word. What is it?

Roman27

Junior Member
May 3, 2001
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What do you call it when a word is defined using the same word you are defining? For example:

1. To be a parent is to be one with parental abilities.
2. To be human is one that is naturally human.

As you can see, these lend nothing to the definition at all; it's a non-definition.

There is a word or phrase for this type of definition, but it has me stumped. Do you know what it is?
 

palad

Golden Member
Jul 18, 2000
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Sorry, 'tautology' was incorrect, Cambridge defines it as 'the unnecessary and usually unintentional use of two words to express one meaning.'
Close, but not quite the same as what you're looking for. Sorry.