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This paper reports the first measurement using the NOvA detectors of [nu] sub([mu]) disappearance in a [nu] sub([mu]) beam. The analysis uses a 14 kton-equivalent exposure of 2.74x10 super(20) protons-on-target from the Fermilab NuMI beam. Assuming the normal neutrino mass hierarchy, we measure (ProQuest: Formulae and/or non-USASCII text omitted) and sin super(2)[theta] sub(23) in the range 0.38-0.65, both at the 68% confidence level, with two statistically degenerate best-fit points at sin super(2)[theta] sub(23)=0.4 3 and 0.60. Results for the inverted mass hierarchy are also presented.