Watching.
"I've been waiting by the window for hours, hoping to spot him coming around the corner."
In plain English: Waiting is the time you spend staying still until something happens or someone arrives.
"He grew tired of the long waiting at the bus stop."
present participle of wait
"The bus driver kept checking his watch while waiting for the last passenger to board."
In plain English: Waiting means staying still until something happens or someone arrives.
"We are waiting for the bus to arrive."
being and remaining ready and available for use
"waiting cars and limousines lined the curb"
"found her mother waiting for them"
"an impressive array of food ready and waiting for the guests"
"military forces ready and waiting"
The word "waiting" comes from the Middle English form waytande, which was built by adding a suffix meaning "-ing" to the verb wait. It entered modern English with the same core sense of staying in one place or expecting something, evolving directly from its earlier spelling variations.