† reckonmasterObs.rare—1. In 6 recken-. [f. reckon v.; cf.Du.rekenmeester, G. rechenmeister.] A professional reckoner, an arithmetician. 1570Dee Math.Pref. *ij, The common Logist, Recken⁓master, or Arithmeticien..imagineth lesse partes: and calleth them Fractions.