Definition of "fiar"

I say, since ye hae sae muckle consideration for me, I'se be blithe to accept your kindness; and my mother and me (she's a life-renter, and I am fiar, o' the lands o' Wideopen) would grant you a wadset, or an heritable bond, for the siller, and to pay the annual-rent half-yearly; and Saunders Wyliecoat to draw the bond, and you to be at nae charge wi' the writings.

1816, Walter Scott, “The Black Dwarf”, in A Complete Edition of the Waverley Novels, volume 13, published 1831, page 108

It seems to be a practice as improper as it is unnecessary, to strike the fiars in three different qualities of the same species of grain; and it should, in our humble opinion, be discontinued.

1817, Committee members, Report respecting the Striking of the Fiars of Grain for the Crop of 1816 for the County of Lanark: The Farmers Magazine, volume 18, page 310

It was answered by the Sheriff. 1st, That the Act of Sederunt did not impose any positive injunction on Sheriffs to strike Fiars; that if the Fiars were substantially just, the Court could have no power to reduce them; and that the Act of Sederunt had never been observed in East Lothian; […] .

1842, Fife Fiars, from 1619 to 1841 Inclusive, page vi

In further confirmation that this is not the date of the origin, it may be stated, that there is very early mention of Commissaries' Fiars, Sir John Connell tracing the commencement of these so far back as the Reformation, when Commissary or Consistorial Courts were established, in place of those of the bishops or their officials; and notice is taken of the Fiars prices of grain in the records of the Commissary Court so far back as 1564—somewhat earlier than the statute above quoted.

1852, George Paterson, Historical Account of the Fiars in Scotland, page 7