Bachelor's degree
A bachelor's degree (from Middle Latin "baccalaureus") or baccalaureate (from Modern Latin "baccalaureatus") is an undergraduate academic degree awarded by colleges and universities upon completion of a course of study lasting three to seven years (depending on institution and academic discipline). In some institutions and educational systems, some bachelor's degrees can only be taken as graduate or postgraduate degrees after a first degree has been completed. In countries with qualifications frameworks, bachelor's degrees are normally one of the major levels in the framework (sometimes two levels where non-honours and honours bachelor's degrees are considered separately), although some qualifications titled bachelor's degrees may be at other levels (e.g. MBBS) and some qualifications with non-bachelor's titles may be classified as bachelor's degrees (e.g. the Scottish MA and Canadian MD).
Diploma of Higher Education
The Diploma certifies that a student has achieved a minimum standard for 2nd Year courses in science and liberal arts. If a student is undertaking a full Bachelor of Arts, a Diploma of Higher Education marks two-thirds of their undergraduate degree. Thus allowing the British Diploma to rank ahead of the American Associate of Arts (which in American parlance is a two-year undergraduate, or half of a BA/BS). That being said, American universities generally consider UK Diplomas equivalent to a college level Associate of Arts even though a British student typically holds more credit hours (and therefore more study time) in the arts, humanities and/or sciences.