singleness

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.

noun

1. The quality or state of being alone: aloneness, isolation, loneliness, solitariness, solitude. See include/exclude.
2. The condition of being one: oneness, singularity, unity. See part/whole.
3. The quality or condition of being unique: oneness, singularity, uniqueness. See same/different/compare.

The noun has 2 meanings:

Meaning #1: without hypocrisy
  Synonym: straightforwardness

Meaning #2: the quality of concentrating on one central objective