膨大

Verb

 * 1) to swell; to distend; to expand

Etymology
First cited to 1872. Likely a coinage in Japan of -derived components, as a compound of. The second sense of is likely a replacement spelling for Chinese-derived homophone, first cited to 1898.

Adjective

 * 1)  swollen and large
 * 2)   huge, gigantic, enormous, massive