well, to make a reasonable guess; have a look of 漢語多功能字庫, please.
對 (u+5c0d) is a character since 甲骨文 (oracle bone script), which is composed by component "丵" (u+4e35), "土" (u+571f), & "又 - 手" (又 originally means right hand).
3 pictures of 對 in oracle bone script:



then, 丵 in small seal script (i can't find this one in oracle bone script at this moment)

土 in oracle bone script

又 - 手 in oracle bone script

the synopsis in this page is:
手持工具開闢土地
the initial meaning of 對 is "using hand (又 - 手) tools (丵) to develop land (土)".
later, in 金文 (bronze script), the form of 對 is slightly changed:



闢地分疆﹒植樹於土﹒立下地界
the meaning of 對 at this time is "planting tree along the boundary of the newly developed land"
with nowadays technology, one might think of "building a fence to protect an area" (e.g. set up barbed wire fence to encircle a farm)
then,
後假借為應對、應答之意
對 was "borrowed" to have the meaning of "response", "reply" or "answer"; which matches of the first two explanations in 國語辭典
http://dict.revised.moe.edu.tw/cgi-bin/cbdic/gsweb.cgi?o=dcbdic&searchid=W00000002366
imo, chopping "對" into "業" & "寸"; errh . . . . "off course" :(
imo, quoting "帝作邦作對" to support the above meaning is appealing.
here's the poem 皇矣 ( with James Legge's english translation)
作之屏之﹒其菑其翳
脩之平之﹒其灌其栵
啟之辟之﹒其檉其椐
攘之剔之﹒其檿其柘
verses in the second group is, opened up, made clearing in forest, paved the area.
then, in third group:
帝省其山﹒柞棫斯拔﹒松柏斯兌
柞 has the meaning of "chop down trees"
帝作邦作對
邦 has the meaning of "planting tree as boundary", similar to 對. imo, "作邦作對" is rhetoric, a "writing in pair". in modern chinese, we still have the saying: 作威作福, or, 作福作威
next, 業 is character since bronze script, which is a 象形字 (pictogram) of "rack for hanging bell, musical instruments". here're 2 samples of 業:


imo, 業 is, unlikely, derived from 對 or 丵.
the meaning of 對 at this time is "planting tree along the boundary of the newly developed land"Are there any examples in old texts where this definition is supported by the context, or is it just a conjecture based on the character components? – Peter Olson Jun 29 '16 at 06:25