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Twenty years after 9/11, the field of homeland security has benefited from several conceptual studies. Those assessed and made recommendations on main domains of homeland security from scholastic and normative viewpoints, how the concept of homeland security should be mirrored in curriculum development, evolution, and program learning outcomes, and what competencies a homeland security graduate, scholar, and educated practitioner needs. However, few studies and texbooks address the evolution of the term of homeland security in the homeland security era from 9/11 to now. While valuable analyses of how homeland security predates and transcends 9/11 have increased, systematic study of how the concept and meaning of homeland security have evolved over the past 20 years continues to be scarce. This ongiong empirical study (quantitative systematic review) systematically tracks the evolution of official homeland security definitions from related federal strategies, frameworks, guidelines, the Quadrennial Homeland Security Reviews (QHSRs), enterprise agencies’ strategic plans, and pertinent legislation. Continuing and changing ingredients of the sprouting public policy and strategy definition of homeland security will be identified.