There are different theories of phonology with different arguments and claims.rnAmong these, Lexical Phonology and Morphology (LMP) is one. And having itsrninteresting innovations, the claims of the theory have not been applied onrnTigrigna - an Ethio-Semitic language. This is the main objective that this studyrntries to deal with. To do so, it is found important first to briefly touch upon thernphonological description of the language. Accordingly, first a brief presentationrnis made on the phoneme inventory of the language where 27 consonant and 7rnvowel segments are identified. In the subsequent chapters, the phonologicalrnand morphological processes in the language are discussed. Accordingly, thernphonological processes of deletion, insertion, and assimilation have beenrndiscussed with relevant examples. Next, different morphological processes:rnsuffixation, prefixation, circumfixation, infixation, compounding, cliticization,rnand zero derivation have been outlined with relevant examples. These twornchapters serve as the scene for the discussion of the major theoretical claims ofrnLPM.rnSubsequently, the following chapter deals with issues that the theory of LPMrninnovated. The discussion made on the morphological processes of thernlanguage shows that Tigrigna has rich morphology. Accordingly, the studyrnassumes that a three strata lexicon for Tigrigna. Stratum I mainly host wordrnformation processes come from 'root-and-pattern' type. In Stratum II, compriserndifferent morphological processes of the language take place. The next lexicalrnlevel, Stratum III hosts compounding. Besides, some of the basic theoreticalrnassumptions that the theory of LPM introduced i.e. the Strict Cyclic Conditionrn(SCC), Bracket Erasure Convention, (BEC) and Elsewhere Condition (EC) havernbeen discussed in light of the Tigrigna language.