1. 凝结物,结石：concluding a contract 缔结合同 | concretion 凝结物,结石 | concurrent 同时的,并行的

2. 固结：concreting 灌筑混凝土 | concretion 固结 | concussion blasting 震动性放炮

3.

3. 结核(作用)：concentric zone theory同心圆地带论 | concretion结核(作用) | condensation凝结

1. the union of diverse things into one body or form or group
    the growing together of parts

    Synonym: coalescencecoalescencycoalitionconglutination

2. an increase in the density of something

    Synonym: compactioncompressiondensification

3. a hard lump produced by the concretion of mineral salts
    found in hollow organs or ducts of the body

    e.g. renal calculi can be very painful

    Synonym: calculus

4. the formation of stonelike objects within a body organ (e.g., the kidneys)