Okay, since there seems to be a lul in the thread.
The word 'steward' in that verse in the LXX Greek is 'oikogenous' which is literally 'born in house', however it is generally understood along with 'ebbed/servant' to be referring to Eliezer's role as 'house manager'.
Likewise, Joseph had a 'steward' in Egypt Gen_43:19 and Christ speaks of 'stewards/oikonomos' and 'stewardships/oikonomia' in various places.
Luk_12:42 And the Lord said, Who then is that faithful and wise steward[oikonomos], whom his lord shall make ruler over his household, to give them their portion of meat in due season?
Luk_16:1 And he said also unto his disciples, There was a certain rich man, which had a steward[oikonomos]; and the same was accused unto him that he had wasted his goods.
Luk_16:2 And he called him, and said unto him, How is it that I hear this of thee? give an account of thy stewardship[oikonomia]; for thou mayest be no longer steward[oikonomos].
Paul:
Tit_1:7 For a bishop must be blameless, as the steward[oikonomos] of God; not selfwilled, not soon angry, not given to wine, no striker, not given to filthy lucre;
1Co_9:17 For if I do this thing willingly, I have a reward: but if against my will, a dispensation[oikonomia] of the gospel is committed unto me.
Eph_3:2 If ye have heard of the dispensation[oikonomia] of the grace of God which is given me to you-ward:
Col_1:25 Whereof I am made a minister, according to the dispensation[oikonomia] of God which is given to me for you, to fulfil the word of God;
Paul uses the term 'dispensation/oikonomia/house law' to describe his unique ministry to the nations, as revealed to him directly from heaven by the ascended and glorified Lord Jesus.
Therefore, the concept of 'dispensation' exists throughout the Bible and is especially used by the Apostle Paul to describe his unique ministry to the nations.
Us 'dispensationalists' agree with Paul and 'dispensationalism' is at least as old as Paul... if not Eliezer.