Which term refers to words ignored in searches due to their lack of meaning?

The term that refers to words ignored in searches due to their lack of meaning is "stop words." Stop words are commonly used words in a language, such as "and," "the," "in," "on," and "is," that are often filtered out in search queries and text processing tasks because they don't provide significant information about the content being analyzed.

By omitting stop words, search algorithms can increase efficiency and improve the relevance of search results, focusing on the more meaningful terms that contribute to the overall context of the information being searched. This practice is widely adopted in various search engine technologies and natural language processing applications to streamline data processing and retrieval.

The other terms, while they might suggest some aspect of the language, do not specifically convey the accepted terminology used in the context of search optimization and text analysis like "stop words" does.