| Name | Kind | Description |
| abstractmo | artifact | abstract base class for all Media Objects |
| AbstractMO | class | |
| activity final | activity final | |
| activity final | activity final | |
| AFrame | class | |
| aframe | artifact | a buffer and render process holding a Audio frame |
| allocation | artifact | |
| Allocation | class | a directive to place a MObject in a specific way |
| anchor | relation | |
| apply | operation | |
| Architecture | component view | The various Components comprising the Cinelerra3 Video editing Application |
| ARender | class | Representation of a Audio render process |
| arender | artifact | Representation of a Audio Render process |
| Assembler | class | This is the actual building facility: provided the correct tools and associations, it serves to build and connect the individual ProcNode objects |
| assembler | artifact | building facility (implementation of the build process) |
| asset | package | sourcecode package Asset Management |
| AssetManagement | component | |
| AssetManager | package | |
| ATTACH | attribute | attach subject to anchor (e.g. an effect to a clip) |
| au1 | class instance | |
| aud_a | class instance | |
| aud_A | class instance | |
| audio | class instance | |
| audio1 | class instance | |
| audio1 | class instance | |
| audio1 | class instance | |
| auto | artifact | Media Object holding automation data |
| Auto | class | Automation data for some parameter (i.e. a time varying function) |
| Automation Entities | class diagram |