Diminutive of phortos; an invoice (as part of freight), i.e. (figuratively) a task or service -- burden.
see GREEK phortos
φορτία (phortia) − 2 Occurrences
φορτίοις (phortiois) − 1 Occurrence
φορτίον (phortion) − 2 Occurrences
φορτίου (phortiou) − 1 Occurrence