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HYDRA spectra of 287 stars in the field of NGC 2506 from the turnoff throughthe giant branch are analyzed. With previous data, 22 are identified asprobable binaries; 90 more are classified as potential non-members.Spectroscopic analyses of ~60 red giants and slowly rotating turnoff starsusing line equivalent widths and a neural network approach lead to [Fe/H] =-0.27 +/- 0.07 (s.d.) and [Fe/H] = -0.27 +/- 0.06 (s.d.), respectively. Liabundances are derived for 145 probable single-star members, 44 being upperlimits. Among turnoff stars outside the Li-dip, A(Li) = 3.04 +/- 0.16 (s.d.),with no trend with color, luminosity, or rotation speed. Evolving from theturnoff across the subgiant branch, there is a well-delineated decline to A(Li)~1.25 at the giant branch base, coupled with the rotational spindown frombetween ~20 and 70 km/s to less than 20 km/s for stars entering the subgiantbranch and beyond. A(Li) remains effectively constant from the giant branchbase to the red giant clump level. A new member above the clump redefines thepath of the first-ascent red giant branch; its Li is 0.6 dex below thefirst-ascent red giants. With one exception, all post-He-flash stars have upperlimits to A(Li), at or below the level of the brightest first-ascent red giant.The patterns are in excellent qualitative agreement with the model predictionsfor low/intermediate-mass stars which undergo rotation-induced mixing at theturnoff and subgiant branch, first dredge-up, and thermohaline mixing beyondthe red giant bump.

WIYN Open Cluster Study, LXXVI. Li Evolution Among Stars of Low/Intermediate Mass: The Metal-Deficient Open Cluster, NGC 2506