The word ad hoc (spaced compound word) is an adverb and an adjective for something done or arranged for a special purpose; from the Latin meaning 'to this'.
Adverb: The committee was formed ad hoc.
Adjective: They passed ad hoc legislation to mitigate the immediate crisis.
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Geometrical lines are abstractions (zero-width objects) which have no physical counterparts, thus no visual representations.
Metaphors (and similar figures of speech like synechdoche) are concrete images which convey an abstract idea. E.g. "The country suffered under the mailed fist of Ghaddafi's rule."
Math is the study of abstractions. Math allows us to isolate one or a few features such as the number, shape or direction of some kind of object. Then we can study what can be learned about the behavior of those features while ignoring everything else about the object.
Math and ArithmeticMath is the study of abstractions. Math allows us to isolate one or a few features such as the number, shape or direction of some kind of object. Then we can study what can be learned about the behavior of those features while ignoring everything else about the objects
Ad hoc pertains to a specific situation, and is often improvised or impromptu. Ad hoc in terms of salary would be reimbursement for things not specifically mentioned in your salary agreement, such as special bonuses, payment to sick or injured employees, or reimbursement for personal expenses not mentioned in your contract.