相

to pity (one another); to commiserate

equal to each other

Physics

principle of relativity

Computing

compatibility issue

marriage counseling; marital counseling

Sumo

facing one's opponent head-on and winning via overwhelmingly superior strength or skill; match in which a yokozuna overpowers his opponent

Sumo

pushing sumo; classic way of wrestling without using the belt

to work (for); to be employed (at); to serve (in)

Law

legal heir; heir-at-law

mutual assured destruction; mutually assured destruction; MAD

mutual support

heir; heiress; inheritor

customer service office; CSO

educational counseling; educational guidance

Computing

relative coordinate

to be different (from each other); to differ

inheritance; inherited property; heritage

Computing

cross connection; interconnection; internetworking

going price; general custom

marked difference

prosopagnosia; face blindness

Mathematics

topology

mutual use of company facilities (e.g. rail tracks for through service, airport facilities, code-sharing, etc.)

Law

decedent; deceased; inheritee