There are multiple definitions:

1. indentation load deflection(English)

   • a test method for polyurethane foam to determine firmness, stiffness or load bearing capacity, by measuring the load required to indent a 50 square inch round indentor foot or compression platen into a sample by 25 %
   • DTI, FSA, HR
   • Materials science, Sleep medicine

2. interstitial lung disease(English)

   • a group of similar lung conditions with lung fibrosis, scarring, or inflammation of the lung tissue. Some patients with ILD also have worsening lung fibrosis, referred to as “progressive fibrosis” (PF-ILD)
   • RB-ILD, CTD, PF-ILD, K-BILD, AIP, COP, DIP, IIP, IPPFE, NSIP
   • Pulmonology
   • https://www.pen…-associated-ild
   • https://doi.org…325-020-01380-4

3. interaural level difference(English)

   • refers to sensitivity of two bilateral cochlear implants
   • ITD, JND
   • Audiology
   • https://doi.org…145124.85517.e8