Meta-analysis, a statistical method used to combine and analyze data from multiple studies, has several synonyms. These include systematic review, research synthesis, quantitative synthesis, and umbrella review. Systematic review is the most common synonym and is often used interchangeably with meta-analysis. Research synthesis is a broader term that encompasses meta-analysis but also includes other methods for combining data. Quantitative synthesis is another term that emphasizes the use of statistical methods to combine data. Umbrella review is a newer term that refers to a systematic review that looks at multiple interventions for a specific condition or disease. These synonyms are useful for researchers and clinicians looking to conduct systematic reviews or meta-analyses of the existing literature.