(1)无；不存在

(2)无效；无法律约束力

(3)无效的行为；无效的东西

• competency of person
• competency of testator
• competency of witness
• competency proceedings
• competency to stand trial
• competent arbitrator
• competent attesting witness
• competent authority
• competent court
• competent evidence
• competent jurisdiction
• competent person
• competent tribunal
• competent witness
• competere
• competing lines
• competing railroads
• competing unions
• competit assisa
• competition
• competition with mails
• competitive advertising
• competitive bidding
• competitive civil service examination
• competitive examination