0 a friend, especially another child, who a child often plays with -- compañero, -a de juegos
We were childhood playmates.
1 a child who plays with another child -- compañero/ra de juego [ masculine-feminine, singular ]
He has lots of playmates at the kindergarten. Él tiene muchos amiguitos en el jardín de infantes.
We can complete it step by step however long the road is and it can't be completed however short the road is if you don't even mark your footprint.
Podemos completarlo paso a paso, por muy largo que sea el camino, y no se puede completar, por corto que sea el camino, si ni siquiera marcas tu huella.