externalize

Concise Oxford English Dictionary © 2008 Oxford University Press:
externalize /ɪkˈstɜːnəlʌɪz/ (or externalise)

▶verb

• 1 give external existence or form to.

  ■ Psychology project (a mental image or process) on to a figure outside oneself.

• 2 Economics fail or choose not to incorporate (costs) as part of a pricing structure.

– derivatives
externalization noun.