Imputation

is used to designate any action or word or thing as reckoned to
a person. Thus in doctrinal language (1) the sin of Adam is
imputed to all his descendants, i.e., it is reckoned as theirs,
and they are dealt with therefore as guilty; (2) the
righteousness of Christ is imputed to them that believe in him,
or so attributed to them as to be considered their own; and (3)
our sins are imputed to Christ, i.e., he assumed our
"law-place," undertook to answer the demands of justice for our
sins. In all these cases the nature of imputation is the same
(Rom. 5:12-19; compare Philemon 1:18, 19).