As a Noun:
1. Activities in which you meet your friends and acquaintances, for example at parties, and relax and have a good time; social activities.
2. A social event, often in someone's home, at which people enjoy themselves doing things such as eating, drinking, dancing, talking, or playing games. English = party.
As a Verb or Adjective:
1. To leave your house and meet other people, particularly at parties, pubs, restaurants and so on. English = go out, socialise.
2. To relate to leisure activities that involve meeting other people. English = (be) social.