異

half-sibling (with a different mother)

mental disorder; mental illness

abnormal behavior (behaviour)

eccentric; queer; unconventional; peculiar; bizarre; strange; odd

relationships with the opposite sex

to be factually incorrect; to differ from the actual facts; to not be the case

cultural exchange; cross-cultural communication; contacts between different cultures

essentially the same with only minor differences

mentally ill person

contamination (esp. foreign bodies in food)

mutant

virus variant

foreigner

heterosexual (person)

Computing

anomalous condition

sexual abnormality

match between fighters of different sports; battle involving two different disciplines

Linguistics

homophone; homonym

Genetics; Medicine

chromosomal abnormality; chromosomal disorder

taste for the exotic; infatuation with a foreign way of life; exoticism

technological singularity; singularity

Proverb

inscrutable are the ways people are brought together; there is no telling how people are brought together; marriages are made in heaven

exoticism

to raise an objection; to voice an opinion different from those of others