(mathematics, relativity) A transformation relating the spacetime coordinates of one frame of reference to another in special relativity.

(biochemistry) A lipocalin associated with the silkworm (of genus Bombyx)

simple past tense and past participle of lock into

(transitive, intransitive) To instruct (that something be done) in one's will. / (transitive) To bequeath (something) to someone in one's will (legal document).