(medicine) Initialism of tricyclic antidepressant. / (aviation) Initialism of terminal control area. / (aviation, travel) Initialism of traffic conference area.

(aviation) Initialism of traffic (alert and) collision avoidance system, a system for warning pilots of impending mid-air collisions and telling them what (if any) evasive action to take.

plural of TCA

(biochemistry) The Krebs cycle.

(uncountable, organic chemistry) Abbreviation of tricyclic acetone peroxide. / (telephony) Transaction Capabilities Application Part (SS7)

plural of TCAP

plural of TCAS