In ABET accreditation criteria, what is the meaning of "one year of X"? The ABET accreditation criteria document for Computer Science lists some course requirements as


One year of Science and Mathematics
At least one half year of Mathematics
One and one-third years of Computer Science 
At least one year of up-to-date coverage of fundamental and advanced topics


How many courses is one year equivalent to? It may mean 10, going by 5 courses per semester. "One year of X" may mean a year where there is at least one course on X every semester. In either case, "one and one-third years" of courses does not make sense.
ABET formally defines a "year" as


  The lesser of 32 semester-hours (or equivalent) or one-fourth of the credits required for graduation [1].


The wiggle room in the definition is almost certainly because of the wide variety of credit systems used by various schools. "One and a third years" would then equate either to 42 semester hours, or four full trimesters or quarters of study for those on alternate study schedules.

[1] http://www.abet.org/eac-criteria-2014-2015/