The word alumnus is singular. It refers to one male or gender-neutral graduate or former student of a school, college,…
The word stimulus is singular. Its standard plural form is stimuli. You will almost never see the plural written as…
The word basis is singular. Its plural form is bases (pronounced BAY-seez). This is a common point of confusion because…
The word focus is singular when it refers to one central point, subject, or area of attention. Its standard plural…
The word medium can be either singular or plural, depending entirely on its meaning. In most academic and professional contexts,…
The short answer is that formula is singular. Its standard plural in modern English is formulas. However, in very formal…
The short answer is that index is singular. Its standard plural form in general English is indexes, while in academic,…
The word appendix is singular. It refers to one supplementary section at the end of a book, document, or report,…
The word phenomenon is singular. It refers to a single fact, event, or circumstance that is observed or studied. The…
The word syllabus is singular. It refers to a single outline or summary of a course of study. The most…