I. ˈsibliŋ, -lēŋ noun
( -s )
Etymology: sib (III) + -ling
1.
a. : one of two or more persons who have the same parents but are not necessarily of the same birth ; sometimes : one of two or more persons having one common parent
sibling rivalry
b. : sib 2b
2. : a member of a sib
II. noun
: one of two or more things related by a common tie or characteristic
the sun has its starry sibling : Alpha Centauri — Philip Morrison