limen (n.)

• bound
• boundary
• bourn
• ceiling
• circumscription
• compass
• cutoff
• deadline
• delimitation
• determinant
• end
• extremity
• finish
• floor
• frontier
• hedge
• interface
• limit
• limitation
• line
• march
• mark
• mete
• perceptibility
• receptiveness
• receptivity
• sensibility
• sensibleness
• sentience
• sentiency
• start
• susceptibility
• term
• terminus
• threshold