T cell activation (GO:0042110)

The change in morphology and behavior of a mature or immature T cell resulting from exposure to a mitogen, cytokine, chemokine cellular ligand, or an antigen for which it is specific

Specific

alpha-beta T cell activation (GO:0046631) gamma-delta T cell activation (GO:0046629) memory T cell activation (GO:0035709) T cell activation involved in immune response (GO:0002286) T cell differentiation (GO:0030217) T cell proliferation (GO:0042098)

General

T cell aggregation (GO:0070489) lymphocyte activation (GO:0046649)

References

gene ontology: GO:0042110