The act of obtaining, or the condition of being obtained, from a definite source.

引出；起源；诱导。

The process of tracing a thing from its original source, esp. a word.

溯源(尤指字源)。

The source from which something is drawn.

来源；出处。

Etymology.

【文法】语源；语源学。

Addition of affixes or change of stem to form derivatives.

【语言】衍生。