Chapter 3 (Review) Flashcards
What does the term ‘mother-in-law’ historically mean?
Stepmother
This illustrates how words can change meanings over time.
Does the truth change if a word’s meaning changes?
No
Truth remains constant even if the expressions of propositions change.
What is the difference between a ‘sentence’ and a ‘proposition’?
A sentence is a string of words; a proposition is the truth or falsehood behind those words.
Can the same sentence express different propositions?
Yes, if the context or word meanings differ.
What does logic study?
The relationships between true or false statements (propositions).
Define ‘cognitive meaning’.
The information a sentence conveys.
Define ‘emotive force’.
The emotion a sentence expresses or evokes.
Give an example of cognitive meaning.
‘There are approximately 20,000 homicides in the U.S.A. each year.’
Give an example of emotive force.
‘There’s a bloodbath on our streets!’
Why should we focus on cognitive meaning in logic?
Emotive language can distract or persuade without evidence.
What is an ambiguous word?
A word that has more than one distinct meaning.
What is a vague word?
A word that has unclear boundaries or borderline cases.
What is the purpose of defining terms?
To eliminate ambiguity or vagueness.
What is the extension of a term?
The set of actual things to which the term applies.
What is the intension of a term?
The properties a thing must have to fit the term’s definition.
What is an ostensive definition?
Defining by pointing to examples.
What is an enumerative definition?
Listing each member individually.
What is a stipulative definition?
Assigning a new meaning independent of old use.
What does ‘genus’ refer to in definitions?
A broad category/class.
What is a species in the context of definitions?
A sub-class within the genus.
What is a necessary condition?
A requirement that must be met for something else to be true.
What is an equivocation?
Using a word with multiple meanings in one argument.
What is a merely verbal dispute?
A false disagreement caused by different meanings of a word or phrase.
What is a circular definition?
A definition that uses the same term you’re trying to define.