Meanings

substitution cipher

base substitution

Columbian exchange

unequal crossing over

sister chromatid exchange

frequency-changer station

differential lung ventilation

genetically modified food

scene change

appraisal

change-over switch

hypallage

hypallage

transfer information (e.g. changing trains)

exchange and consolidation (of lands)

business card exchanging party

New Year party where greetings (or business cards, etc.) are exchanged

exchanging business cards

business card exchanging party

allocation of replotted land