(rare) A polite, formulaic end to a letter or email.
noun
plural of best
2010, Hunter Allen, Andrew Coggan, Training and Racing with a Power Meter, 2nd Ed., →ISBN ˡⁱⁿᵏ
By plotting all of your bests over the entire selected time span, you can grasp the rate of your wattage decay as the duration of the effort increases[.]
verb
third-person singular simple present indicative of best