交际
jiāo jì · HSK 4
social intercourse
🤝💬 交 = exchange/cross + 际 = boundary/edge → exchange across boundaries
交 means to exchange or interact (think 交换 exchange); 际 means boundary or between (as in 国际 international). Together: contact across boundaries between people — social interaction, communication.
交 — top 亠 + 父-like crossed legs
Originally a pictograph of a person standing with legs crossed, showing the idea of crossing or intersecting. From this concrete image, the meaning extended to abstract senses like 'exchange,' 'interact,' and 'hand over.' Modern uses such as 交流 (exchange) and 交通 (traffic) all trace back to this core notion of crossing.