by R. Lucas Stamps

Here are some basic terms for the Trinity (thanks to Thomas Aquinas):

Five notions

1. Innascibility (unbegottenness)

2. Paternity

3. Sonship

4. Common Spiration

5. Procession

Four relations

1. Paternity

2. Sonship

3. Common Spiration

4. Procession

Three persons

1. Father

2. Son/Word/Image

3. Holy Spirit/Love/Gift

Two processions

1. Generation

2. Spiration

One essence

1. The one divine nature