infiltrate /inˈfil-trāt or -filˈ/

1. To cause to filter
2. To cause to filter into
3. To sift into
4. To permeate

1. To permeate gradually
2. To sift or filter in

(of troops, agents, etc) to enter (a hostile area) secretly and for subversive purposes

Any substance permeating a solid

infiltrāˈtion noun

1. The process of infiltrating
2. Gradual permeation or interpenetration
3. Gradual accession or introduction of a new element, as of population or troops
4. A deposit or substance infiltrated

inˈfiltrative adjective

inˈfiltrator noun

Someone who becomes accepted as a member of a group towards which he or she has hostile or subversive intentions

• scalers
• scales
• scale stair
• scale staircase
• scale stairs
• scalework
• scaleworks
• scalier
• scaliest
• scaliness
• scalinesses
• scaling
• scaling circuit
• scaling ladder
• scaling ladders
• scalings
• scall
• scallawag
• scallawags
• scalled
• scallies
• scallion
• scallions
• scallop
• scalloped