What is the guideline regarding Latin abbreviations in APA style?

The guideline that Latin abbreviations should be spelled out the first time they are used ensures clarity and understanding for all readers. The use of abbreviations, especially those derived from Latin, may not be universally recognized or familiar to every reader, thus spelling them out initially provides context and comprehension. After the first use, it is acceptable to use the abbreviation alone throughout the rest of the document. This practice promotes clear communication in academic writing, aligning with APA's emphasis on accessibility and clarity in scholarly discourse.

While spelling out every instance or avoiding abbreviations entirely could be considered overly cautious or unnecessarily verbose, the strategy of spelling them out first strikes a balance between readability and efficiency in writing.