noun

• (countable, uncountable) Worry.
  "I don’t have a care in the world."
• (uncountable) Maintenance, upkeep.
  "dental care"
• (uncountable) The treatment of those in need (especially as a profession).
  "The US supreme court has ruled unanimously that natural human genes cannot be patented, a decision that scientists and civil rights campaigners said removed a major barrier to patient care and medical innovation."
• (uncountable) The state of being cared for by others.
  "in care"

verb

• (transitive, intransitive) To be concerned (about), to have an interest (in); to feel concern (about).
  "She doesn’t care what you think."
• (intransitive, polite, formal, chiefly in the negative) To want, to desire; to like; to be inclined towards or interested in.
  "Would you care for another slice of cake?"
• (intransitive, informal, by extension) To be affected by, to treat as relevant for a subsequent course of action.
  "An event aggregator facilitates a fire-and-forget model of communication. The object triggering the event doesn’t care if there are any subscribers. It just fires the event and moves on."
• (intransitive) (with for) To look after or look out for.
  "Young children can learn to care for a pet."