How do I Say and Write
"Three" in Japanese?

Pronunciation : Three
Part of Speech : a.
Etymology : [OE. ?re, ?reo, ?ri, AS. ?ri, masc., ?re?, fem. and neut.; akin to OFries. thre, OS. thria, threa, D. drie, G. drei, OHG. dri, Icel. ?rir, Dan. & Sw. tre, Goth. ?reis, Lith. trys, Ir., Gael. & W. tri, Russ. tri, L. tres, Gr. trei^s, Skr. tri. *301
Definition : Defn: One more than two; two and one. "I offer thee three things." 2 Sam. xxiv. 12. Three solemn aisles approach the shrine. Keble.

Note: Three is often joined with other words, forming compounds signifying divided into, composed of, or containing, three parts, portions, organs, or the like; as, three-branched, three-capsuled, three-celled, three-cleft, three-edged, three-foot, three-footed, three-forked, three-grained, three-headed, three-legged, three- mouthed, three-nooked, three-petaled, three-pronged, three-ribbed, three-seeded, three-stringed, three-toed, and the like.
Source : Webster's Unabridged Dictionary, 1913

Pronunciation : Three
Part of Speech : n.
Definition : 1. The number greater by a unit than two; three units or objects.

2. A symbol representing three units, as 3 or iii. Rule of three. (Arith.) See under Rule, n.
Source : Webster's Unabridged Dictionary, 1913