What does the acronym TD mean?

There are several fields where the initialism is used:

internet domain : Chad (in Africa)

US football : touchdown

Medical : transdermal, tardive dyskinesia (motor control)

Immunology: tetanus/diphtheria

Automotive : turbo-diesel

Banking : Toronto-Dominion

Military: tank destroyer, time delay (fuse)

Electronics and broadcasting : time delay

Oil Drilling : total depth

Sports : Tournament Director

Legal : trust deed