intrusion (n.)

• access
• admission
• alienage
• alienism
• encroachment
• entrance
• entree
• entry
• extraneousness
• foreignness
• import
• importation
• importing
• impropriety
• inappropriateness
• inauspiciousness
• income
• incoming
• inconvenience
• incursion
• inexpedience
• infelicity
• infiltration
• infraction
• infringement
• ingress
• inopportuneness
• input
• inroad
• insertion
• insinuation
• intake
• interpenetration
• interposition
• interruption
• intervention
• introduction
• irrelevance
• lateness
• leakage
• nonconformity
• penetration
• percolation
• prematurity
• reception
• seepage
• transgression
• trespass
• unfavorableness
• unfitness
• unpropitiousness
• unseasonableness
• unsuitability
• untimeliness
• usurpation
• wrongness