1. (n.) O, the fifteenth letter of the English alphabet, derives its form, value, and name from the Greek O, through the Latin. The letter came into the Greek from the Phoenician, which possibly derived it ultimately from the Egyptian. Etymologically, the letter o is most closely related to a, e, and u; as in E. bone, AS. ban; E. stone, AS. Stan; E. broke, AS. brecan to break; E. bore, AS. beran to bear; E. dove; E. toft, tuft; tone, tune; number, F. nombre.

2. (n.) Among the ancients, O was a mark of triple time, from the notion that the ternary, or number 3, is the most perfect of numbers, and properly expressed by a circle, the most perfect figure.

3. (n.) The letter O, or its sound.

4. (n.) Something shaped like the letter O; a circle or oval.

5. (n.) A cipher; zero.

6. (a.) One.

7. (interj.) An exclamation used in calling or directly addressing a person or personified object; also, as an emotional or impassioned exclamation expressing pain, grief, surprise, desire, fear, etc.

Americanize Anglicize O OK accept accord acculturate acculturize acknowledge acquiesce acquire admit everything admit exceptions adopt affiliate agree agree provisionally allow allow for assent assent grudgingly assimilate assume avow barge in be admitted break in breeze in brook burst in bust in come barging in come breezing in come busting in come by come clean come in come in for complete comprehend comprise concede confer citizenship confess consent consider consider the circumstances consider the source contain cop a plea count in cover creep in cross the threshold crowd in declare derive derive from discount dispense disregard divulge drag down draw draw from drop in edge in embody embrace encircle enclose encompass enter entertain envisage express general agreement fill fill in fill out gain gain admittance get get in give an entree give leave give permission give the go-ahead give the word go along with go in go into go native grant harbor have have an entree have an in have coming in hold hop in house immit include incorporate induct initiate insert install interject interpose introduce intromit intrude irrupt jam in jump in leave let let in let on lift temporarily lodge look in make allowance for make possible naturalize not oppose number among obtain occupy okay open up out with it own own up pack in permit plead guilty pop in press in provide for pull down push in put in receive reckon among reckon in reckon with recognize relax relax the condition release reveal say the word secure set aside set foot in shelter slip in spill spill it spit it out squeeze in step in subscribe suffer take take account of take cognizance of take in take into account take into consideration take on take over take up tell all tell the truth throw open to thrust in tolerate visit vouchsafe waive warrant wedge in work in yield