Which word refers to a pretentious display meant to impress others?

The word that accurately describes a pretentious display meant to impress others is "ostentation." This term is derived from the Latin word "ostentare," which means to show or exhibit. It specifically refers to actions, behaviors, or styles that are overly showy or extravagant, often with the intent of attracting attention or admiration. In contexts where someone is seeking to demonstrate wealth, knowledge, or status in an exaggerated manner, ostentation would be the fitting description.

The other choices do not capture this meaning. An oxymoron refers to a figure of speech in which contradictory terms appear in conjunction, while pecuniary relates to money or financial matters. Penurious describes someone who is extremely poor or stingy. These terms do not convey the idea of a showy, pretentious display intended to impress others.