sólo
only
solo
alone
Sólo means only and is related to the English word solo0, which means alone0. Think of something being the 'only' one, it's alone.
adverb
  1. only
    Only; just; merely
    Sólo quiero un café. // I only want a coffee.
adjective
  1. alone
    Alone; by oneself
    Prefiero estar sólo. // I prefer to be alone.