during

"During" is a preposition that indicates the time period in which an action or event takes place. It is often used to specify the duration of an event or the time frame within which something occurs. For example, "During the summer, I visited my grandparents" indicates that the visiting took place within the summer period.

The word "during" can also be used to describe the time period in which a state or condition exists. For instance, "During his illness, he was unable to work" means that his inability to work coincided with his illness.

In some contexts, "during" can be replaced with other prepositions like "while" or "throughout," but it is particularly useful when the duration of an event or state is clearly defined. It is commonly used in both formal and informal writing and speech.

"During" is derived from the Old English word "durian," which means "lasting" or "enduring." The word has been in use since the 14th century and has remained consistent in its meaning and usage over time.