| Acronym | Meaning |
| LCCO | Linear Combination Of Cellular Orbital |
| LCCSD | Linearized Coupled-cluster (theory With) Single (and) Double (excitations) (in Mol. Potential Calcns.) |
| LCCW | Linear Combination Of Configurational Wave Functions |
| LCD | Liquid Crystal Diode |
| LCD | Liquid Crystal Display |
| LCDA MO | Linear Combination Of Donor-acceptor Molecular Orbital Theory |
| LCDAO | Linear Combination Of Distorted Atomic Orbitals |
| LCDO | Linear Combination Of Diatomic Orbitals |
| LCEC | Liquid Chromatography With Electrochemical Detection |
| LCF | Low-cycle Fatigue |
| LCFA | Long Chain Fatty Acid(s) |
| LCFC | Linear Combination Of Fragment Configuration |
| LCFFUA | Linear Combination Of Floating Functions Of United Atom |
| LCGDO | Linear Combination Of Generalized Diatomic Orbitals |
| LCGO | Linear Combination Of Gaussian Orbitals |
| LCGO | Linear Combination Of Group Orbitals |
| LCGTO | Linear Combination Of Gaussian Type Orbitals |
| LCGTO-DF | Linear Combination Of Gaussian Type Orbitals-density Functional |
| LCGTO-FF | LCGTO-fitting Function |
| LCGTO-LDF | Linear Combination Of Gaussian-type Orbitals-local Density Functional |
| LCGTO-LSD-VW | Linear Combination Of Gaussian Type Orbitals-local Spin Density-Vosko-Wilk-Nusair |
| LCGTO-MCP-LS | Linear Combination Of Gaussian-type Orbitals-model Core Potential-local Spin Density |
| LCHAD | Long-chain 3-hydroxyacyl-CoA Dehydrogenase |
| LCHAO | Linear Combination Of Hybrid Atomic Orbitals |
| LCHOP | Linear Combination (of) Harmonic Oscillator Products |
| LCI | Life Cycle Inventory |
| LCI-CNDO | Limited Configuration Interaction-complete Neglect Of Differential Overlap |
| LCI-SCSCFMO | Limited Configuration Interaction Single-configuration SCF MO |
| LCIA | Life Cycle Impact Assessment |
| LCICD | Liquid Crystal Induced Circular Dichroism |
| LCIF | Linear Combination Of Interacting Forces |
| LCIS | Lobular Carcinoma In Situ |
| LCL | Lymphoblastoid Cell Line |
| LCLO | Linear Combination Of Localized Orbitals |
| LCLS | Linac Coherent Light Source |
| LCM | Life Cycle Management |
| LCM | Liquid Composite Molding |
| LCMBPT | Linked Cluster Many Body Perturbation Theory |
| LCMO | Linear Combination Of Molecular Orbitals |
| LCMS | Liquid Chromatography-mass Spectrometry |
| LCMTO | Linear Combination Of Muffin-tin Orbitals |
| LCMV | Lymphocytic Choriomeningitis Virus |
| LCMVAO | Linear Combination Of Modified Valence Atomic Orbital |
| LCN | Light Cracked Naphtha |
| LCO | Light Cycle Oil |
| LCOAO | Linear Combination Of Orthogonal Atomic Orbitals |
| LCOPW | Linear Combination Of Orthogonalized Plane Waves |
| LCP | Liquid Crystal Polymer |
| LCP | Local Complex Potential (in Electron-atom Scattering) |
| LCPA | Local Coherent Potential Approximation |