Denshi Jisho — Online Japanese dictionary

一部 いちぶ 1: one part; one portion; one section; some;
2: one copy (e.g. of a document)
Common word, Adverbial noun, Noun 
一部分 いちぶぶん part; portion; section
Common word, Noun 
一部緩和 いちぶかんわ partial relaxation; partial easing
Noun, Suru verb, No-adjective 
一部保険 いちぶほけん under-insurance
Noun, No-adjective 
一部始終 いちぶしじゅう full particulars; the whole story; from beginning to end
Noun 
一部の隙もない いちぶのすきもない impeccable
Irregular kanji usage, Expression, Adjective 
一部のすきもない いちぶのすきもない impeccable
Irregular kanji usage, Expression, Adjective 

You can also

Look up kanji details for 一部.

Try a Yahoo Jisho search for 一部 .
Try a Goo Jisho search for 一部 .
Try a Google search for 一部 .