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.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Inquiring \In*quir"ing\, a.
   Given to inquiry; disposed to investigate causes; curious;
   as, an inquiring mind.
   [1913 Webster]

WordNet (r) 3.0 (2006):

inquiring
    adj 1: given to inquiry; "an inquiring mind" [ant:
           uninquiring, uninquisitive]
    n 1: a request for information [syn: questioning, inquiring]

Moby Thesaurus II by Grady Ward, 1.0:

52 Moby Thesaurus words for "inquiring":
   Socratic method, agape, agog, all agog, analysis, asking,
   bringing into question, burning with curiosity,
   catechetical method, catechistic, catechization, catechizing,
   challenge, consumed with curiosity, curious, dispute, examination,
   ghoulish, gossipy, inquest, inquirendo, inquiring mind, inquiry,
   inquisition, inquisitional, inquisitive, inquisitorial, interested,
   interpellation, interrogation, interrogational, interrogative,
   interrogatory, investigative, itchy, morbid, morbidly curious,
   open-eyed, openmouthed, overcurious, probing, prurient, pumping,
   querying, questioning, quiz, quizzical, quizzing, scopophiliac,
   seeking, supercurious, voyeuristic