[ C ] a person whose job is to carry things, especially travellers' bags at railway stations, airports, hotels etc.:
There aren't any porters, so we'll have to find a trolley for the luggage.
UK US doorman [ C ] someone whose job is to take care of a large building where many people live and be present at its entrance in order to help people who live or visit there:
The porter opened the door for me and then called a taxi.
US [ C ] a person whose job is to help travellers who are spending the night on a train by arranging their bed, taking care of their bags, etc.