Final answer:
True. The meaning of abbreviations can be found in a key. This statement is true.
Step-by-step explanation:
The statement 'The meaning of abbreviations can be found in a key' is true. A key is a tool used to provide a list of abbreviations along with their meanings. When encountering an abbreviation in a text, referring to the key helps in understanding the intended meaning. For example, in a science textbook, the key may list 'mm' as the abbreviation for millimeter, allowing readers to comprehend measurements more easily.