Merriam-Webster's Collegiate® Dictionary, 11th Edition
THIS
I. pro noun (plural these)
Etymology: Middle English, pro noun & adjective , from Old English thes (masculine), this (neuter); akin to Old High German dese this, Old English thæt that Date: before 12th century
1. a. the person, thing, or idea that is present or near in place, time, or thought or that has just been mentioned , what is stated in the following phrase, clause, or discourse , this time or place ,
2. the one nearer or more immediately under observation or discussion , the one more recently referred to,
II. adjective (plural these) Date: before 12th century
1. being the person, thing, or idea that is present or near in place, time, or thought or that has just been mentioned , constituting the immediately following part of the present discourse, constituting the immediate past or future , being one not previously mentioned, being the nearer at hand or more immediately under observation or discussion ,
III. adverb
Date: 15th century
to the degree or extent indicated by something in the immediate context or situation