exchange (e.g. cultural); interchange; interaction; alternating current; AC
change; alternation; rotation; replacement; substitution; shift
company; friendship; association; (romantic) involvement; dating
crossing; intersection; (genetic) crossing over
diplomacy; selling (e.g. door-to-door); canvassing
social life; social intercourse
traffic; transportation; communication; exchange (of ideas, etc.); intercourse
police box; koban; alternation; alternating (current, stress, etc.)
telecommunications; correspondence
copulation (among animals); mating; treading; covering; serving
sexual intercourse; sex; coitus
intimacy; friendship; friendly relations
gathering; mixer; meetup; assembly; social; exchange meeting
sexual intercourse; sexual liaison; intimacy
exchange of courtesies (cordialities); fraternization; fraternisation
mixture; intermixture; mixing up; contamination
summoning spirits; calling down spirits; spirit evocation; communing with spirits; communicating with the dead; spiritualism
police mobile traffic unit
traffic conditions (e.g. heavy traffic); transportation situation (e.g. bad roads)
breaking off relations (esp. between countries)
hybridization; crossing; mixing
traffic light; traffic signal
commissura; commissurae; commissure; commissural
change from spring to summer
exchange of courtesies (cordialities); fraternization; fraternisation
alternating current and direct current; AC/DC
doyen of the diplomatic corps
angle of intersection; intersection angle
composite vessel construction (wood, iron, etc.)