What term describes an air parcel that contains all the water vapor it can hold?

The term that describes an air parcel that contains all the water vapor it can hold is "saturated." When air is saturated, it means that it has reached its maximum capacity for moisture at a specific temperature and pressure. At this point, any additional moisture will cause condensation to occur, leading to the formation of clouds or precipitation.

Saturation is closely related to temperature; warmer air can hold more moisture than cooler air. The concept is critical in meteorology and aviation because understanding when air becomes saturated helps predict weather changes, cloud formation, and potential turbulence that pilots must be aware of while flying.

The other terms, while related to humidity and moisture, do not accurately describe a state of maximum moisture content in the air. For instance, "dew point" refers to the specific temperature at which air becomes saturated. "Condensed" refers to water vapor transitioning to a liquid state, and "dry" indicates the absence of moisture in the air. These concepts are important in the study of weather and air traffic control but do not define the state of saturation.