Merriam-Webster Collegiate Dictionary - below

 I. adverb  Etymology: Middle English bilooghe, from bi by + looghe low, adjective  Date: 14th century  1. in or to a lower place  2.  a. on earth  b. in or to Hades or hell  3. on or to a lower floor or deck  4.  a. in, to, at, or by a lower rank or number  b. ~ zero the temperature was 20 ~  5. lower on the same page or on a following page  6. under the surface of the water  II. preposition  Date: 1575  1.  a. lower in place, rank, or value than ; under  b. down river from  c. south of  2. inferior to (as in rank)  3. not suitable to the rank of ; beneath  III. noun  Date: 1697 something that is ~  IV. adjective  Date: 1916 written or discussed lower on the same page or on a following page