we

from The Century Dictionary.

• noun An abbreviation of Wednesday.
• I and another or others; I and he or she, or I and they: a personal pronoun, taking the possessive our or ours (see our) and the objective (dative or accusative) us.
• We is sometimes, like they, vaguely used for society, people in general, the world, etc.; but when the speaker or writer uses we he identifies himself more or less directly with the statement; when he uses they he implies no such identification. Both pronouns thus used may be translated by the French on and the German man. as, we (or they) say, French on dit, German man sagt.
• We is frequently used by individuals, as editors and authors, when alluding to themselves, in order to avoid the appearance of egotism which it is assumed would result from the frequent use of the pronoun I. The plural style is used also by kings and other potentates, and is said to have been first used in his edicts by King John of England; according to others, by Richard I. The French and German sovereigns followed the example about the beginning of the thirteenth century.
• We and us are sometimes misused for each other.

from the GNU version of the Collaborative International Dictionary of English.

• pronoun The plural nominative case of the pronoun of the first person; the word with which a person in speaking or writing denotes a number or company of which he is one, as the subject of an action expressed by a verb.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• pronoun personal The speakers/writers, or the speaker/writer and at least one other person.
• pronoun personal The speaker/writer alone. (The use of we in the singular is the editorial we, used by writers and others, including royalty—the royal we—as a less personal substitute for I. The reflexive case of this sense of we is ourself.)
• pronoun personal Plural form of you, including everyone being addressed.
• determiner The speakers/writers, or the speaker/writer and at least one other person.