Dictionary Definition :
Definition[1]
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The trikāya: 法 dharmakāya, the absolute or spiritual body; 報 sambhogakāya, the body of bliss; 化 nirmānakāya, the body of incarnation. In Hīnayāna 法身 is described as the commandments, meditations, wisdom, nirvāna, and nirvāna-enlightenment; 報身 is the reward-body of bliss; 化 or 應 (化) is the body in its various incarnations. In Mahāyāna, the three bodies are regarded as distinct, but also as aspects of one body which pervades all beings. Cf. 三身.
Source
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A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous
Definition[2]
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(術語)大小乘通用之名目也。小乘以戒定慧解脫解脫知見五品之功德為法身。以王宮所生相好之形為報身。以化獼猴鹿等為化身。若就大乘則即天台之法報應。又法相宗自性受用變化之三身也。
Source
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丁福保《佛學大辭典》