noun, takes する, transitive verb

  1. opening (a letter, parcel, etc.), breaking the seal.
  2. unboxing (a product).

noun

  1. unsealed mail.

Variations

Pronunciation Kanji Kana Is Common
開封 かいふう

Contained Kanji Breakdown

open, unfold, unseal
カイ ひら.く あ.く (3rd, N4)
gate, counter for cannons
モン かど と (2nd, N2)
open, initiate, begin
one, one radical (no.1)
イチ いっ ひと- (1st, N5)
twenty, twenty or letter H radical (no. 55)
キョウ ク にじゅう (Kentei 1)
seal, closing
フウ ホウ (8th, N2)
square jewel, corner, angle
ケイ ケ か (Kentei Pre-1, N1)
soil, earth, ground
ド つち は (1st, N5)
measurement, tenth of a shaku, a little
スン す みき (6th, N1)