adj

• (grammar) Pertaining to an action performed customarily, ordinarily, or usually.
  "In English, for instance, the Habitual Aspect (used to construction) can combine freely with Progressive Aspect, to give such forms as used to be playing."

noun

• (colloquial) One who does something habitually, such as a serial criminal offender.
  "It has been suggested that we should classify prisoners as casuals and habituals. If a casual is to be distinguished from an habitual simply by the length of his sentence, this classification would hardly answer."
• (grammar) A construction representing something done habitually.
  "Since any situation that can be protracted sufficiently in time, or that can be iterated a sufficient number of times over a long enough period – and this means, in effect, almost any situation – can be expressed as a habitual, it follows that habituality is in principle combinable with various other aspectual values, namely those appropriate to the kind of situation that is prolonged or iterated."