Around or surrounding :) Los alrededores can also mean "the suburbs"

al rededor = autour = around . Par exemple: el bar tiene asientos de madera en todo el rededo la barre a des sièges en bois tout autour the bar seats are made of wood all round ou al rededor del mundo // autour le monde //

Around the world = al rededor del mundo. Around 5 pm = al rededor de las 5 pm. Around me = al rededor de mi

"alrededor" equal around, for example. Correr 3 kilometros alrededor del parque. I run 3 kilometer around park.

"Rededor" does exist and it means outline or contour. However, we don't use that word anymore, only when we say "al rededor". It's ortographically correct to write it in two words, but it's muuuch more common (and preferrable) to write it in only one word: "alrededor".