sin·gle·ness /ˈsɪŋgəlnəs/
  單一,單獨,獨身
  Sin·gle·ness, n.
  1. The quality or state of being single, or separate from all others; the opposite of doubleness, complication, or multiplicity.
  2. Freedom from duplicity, or secondary and selfish ends; purity of mind or purpose; simplicity; sincerity; as, singleness of purpose; singleness of heart.
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  singleness
       n 1: without hypocrisy; "the singleness of his motives could not
            be questioned" [syn: straightforwardness]
       2: the quality of concentrating on one central objective; "his
          singleness of purpose"