(1):
(n.) A relation between species or highe/ groups dependent on resemblance in the whole plan of structure, and indicating community of origin.
(2):
(n.) Relationship by marriage (as between a husband and his wife's blood relations, or between a wife and her husband's blood relations); - in contradistinction to consanguinity, or relationship by blood; - followed by with, to, or between.
(3):
(n.) Kinship generally; close agreement; relation; conformity; resemblance; connection; as, the affinity of sounds, of colors, or of languages.
(4):
(n.) Companionship; acquaintance.
(5):
(n.) That attraction which takes place, at an insensible distance, between the heterogeneous particles of bodies, and unites them to form chemical compounds; chemism; chemical or elective affinity or attraction.
(6):
(n.) A superior spiritual relationship or attraction held to exist sometimes between persons, esp. persons of the opposite sex; also, the man or woman who exerts such psychical or spiritual attraction.