There are multiple definitions:

1. consumer price index(English)

   • Financial issues

2. cardiac power [output] index(English)

   • defined as the product of flow (cardiac index) and mean arterial pressure = CPO/BSA
   • BSA, CI, CPO, MAP
   • Cardiology, Hemodynamics
   • https://doi.org/10.1002/ejhf.268

3. checkpoint inhibitor(English)

   • an immune activator, clinically acting through a mechanism of double-inhibition by targeting the PD1 (programmed cell death receptor) and its ligands (PD-L1 and PD-L2), as well as the CTLA-4 (cytotoxic T-lymphocyte-associated antigen 4) and its ligand B7 on both immune cells and cancer cells. Immunomodulation by CPIs alters T-cell–mediated antigen-specific response to more effectively target cancers attempting to evade the body’s immune response by displaying checkpoint proteins on cancer cell surfaces
   • CTLA4, ACR
   • Oncology, Therapeutic approaches, Apoptosis, Transplantation
   • https://doi.org…LURE.121.008859

4. Community Periodontal Index(English)

   • screening plays an important role in the prevention of periodontal disease and promotes an improvement in oral health-related quality of life
   • HRQoL, PD
   • Dentistry, Quality of life, Lifestyle
   • https://doi.org…2903-016-0216-x

5. C-peptide index(English)

   • a ratio of serum C-peptide to plasma glucose levels; a readily measured index of β-cell function
   • F-CPI, OGTT, PP, PP-CPI
   • Insulin, Metabolism, Ratio-based metric
   • https://doi.org…bol.2013.05.022

6. cysteine proteinase inhibitor(English)

   • found in various animal and plant tissues, and many of them have been isolated and characterized in terms of protein structure and inhibitory activity
   • Molecular biology, Biochemistry
   • https://doi.org…bmb.2007.05.003
   • https://www.ebi.ac.uk/merops/