Webster's 1828 Dictionary
SINGLENESS
n. 1. The state of being one only or separate from all others; the opposite of doubleness, complication or multiplicity.
2. Simplicity; sincerity; purity of mind or purpose; freedom from duplicity; as singleness of belief; singleness of heart.
Webster's 1913 Dictionary
SINGLENESS
SINGLENESS 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.
Sanseido Wisdom Dictionary
singleness
s í ngle ness 名詞 U 1 単一 (性 ), 単独 ; 未婚, 独身 .2 誠実さ, 純粋さ ; ひたむきさ .
The Wordsmith Dictionary