The Collaborative International Dictionary of English v.0.48:

Inquire \In*quire"\, v. i. [imp. & p. p. Inquired; p. pr. &
   vb. n. Inquiring.] [OE. enqueren, inqueren, OF. enquerre,
   F. enqu['e]rir, L. inquirere, inquisitum; pref. in- in +
   quarere to seek. See Quest a seeking, and cf. Inquiry.]
   [Written also enquire.]
   1. To ask a question; to seek for truth or information by
      putting queries.
      [1913 Webster]

            We will call the damsel, and inquire. --Gen. xxiv.
                                                  57.
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            Then David inquired of the Lord yet again. And the
            Lord answered him.                    --1 Sam.
                                                  xxiii. 4.
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   2. To seek to learn anything by recourse to the proper means
      of knowledge; to make examination.
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            And inquire
            Gladly into the ways of God with man. --Miltom.
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   Note: This word is followed by of before the person asked;
         as, to inquire of a neighbor. It is followed by
         concerning, after, or about, before the subject of
         inquiry; as, his friends inquired about or concerning
         his welfare. "Thou dost not inquire wisely concerning
         this." --Eccl. vii. 10. It is followed by into when
         search is made for particular knowledge or information;
         as, to inquire into the cause of a sudden death. It is
         followed by for or after when a place or person is
         sought, or something is missing. "Inquire in the house
         of Judas for one called Saul of Tarsus." --Acts ix. 11.
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The Collaborative International Dictionary of English v.0.48:

Enquire \En*quire"\, v. i. & t.
   See Inquire.
   [1913 Webster]

WordNet (r) 3.0 (2006):

enquire
    v 1: inquire about; "I asked about their special today"; "He had
         to ask directions several times" [syn: ask, inquire,
         enquire]
    2: conduct an inquiry or investigation of; "The district
       attorney's office investigated reports of possible
       irregularities"; "inquire into the disappearance of the rich
       old lady" [syn: investigate, inquire, enquire]
    3: have a wish or desire to know something; "He wondered who had
       built this beautiful church" [syn: wonder, inquire,
       enquire]