1) Accustom 2) Acquaint 3) Clarify 4) Clarify in detail 5) Cover 6) Define 7) Depict 8) Describe 9) Develop 10) Expand on 11) Explicate 12) Express 13) Give further details about 14) Give reasons 15) Give reasons for 16) Go over 17) Illustrate 18) Impart 19) Inform 20) Make clear 21) Make plain and comprehensible 1) Clarify 2) Define 3) Demonstrate 4) Elucidate 5) Exhibit 6) Explicate 7) Gloss 8) How so 9) Interpret 10) Resolve 11) Unfold 
• (a.) To flatten; to spread out; to unfold; to expand. • (v. i.) To give an explanation. • (a.) To make plain, manifest, or intelligible; to clear of obscurity; to expound; to unfold and illustrate the meaning of; as, to explain a chapter of the Bible.
1. To flatten; to spread out; to unfold; to expand. 'The horse-chestnut is . . . Ready to explain its leaf.' (Evelyn) ... 2. To make plain, manifest, or intelligible; to clear of obscurity; to expound; to unfold and illustrate the meaning of; as, to explain a chapter of the Bible. 'Commentators to explain the difficult passages to you.' (Gay) To ex...
Ex·plain' (ĕks*plān') transitive verb [ imperfect & past participle Explained (- plānd'); present participle & verbal noun Explaining .] [ Latin explandare to flatten, spread out, explain; ex out + ...Ex·plain' intransitive verb To give an explanation. 
[v] - define 2. [v] - make palin and comprehensible
explicate verb make plain and comprehensible; `He explained the laws of physics to his students`
means to account for something / to provide reasons, i.e. how and why .
to make plain or clear; render understandable or intelligible: to explain an obscure point. · to make known in detail: to explain how to do something. · to assign a meaning to; interpret: How can you explain such a silly remark? · to make clear the cause or reason of; account for: I cannot explain his strange behavior.
[Test terms] make plain and comprehensible[TEKS ELAR vocabulary] make plain and comprehensible[SAT terms] make plain and comprehensible[PARCC7 glossary] define[Common core terms] make plain and comprehensible