基部 is read as きぶ (kibu) and means base.
きぶ
kibu
きじゅん
standard
もと
cause
きほん
basics
きち
base (military, expedition, etc.)
きばん
bedrock
きそ
foundation
もとづく
to be based (on)
きほんてき
fundamental
ききん
fund
きちょう
keynote
きかん
mainstay
きじゅんほう
basic law