has been preconditioning

• present perfect progressive

  present perfect progressive

  Used to describe an action that began in the past, has continued continuously, and is still in progress.

  of precondition (3rd person singular).
  precondition

  noun

  something that must come before or is necessary to a subsequent result; condition.

Related Words

• arrangement
• essential
• necessity
• prerequisite
• provision
• qualification
• requirement
• requisite
• stipulation