formal as in a lavish dance requiring formal attire

ballform into a ball by winding or rolling; round object that is hit or thrown or kicked in games; a solid projectile that is shot by a musket; an object with a spherical shape; the people assembled at a lavish formal dance; one of the two male reproductive glands that produce spermatozoa and secrete androgens; a spherical object used as a plaything; United States comedienne best known as the star of a popular television program (1911-1989) ; a compact mass; a lavish dance requiring formal attire ; a more or less rounded anatomical body or mass; a ball game played with a bat and ball between two teams of nine players; a pitch that is not in the strike zone

formal as in a gown for evening wear

formal as in being in accord with established forms and conventions and requirements (as e.g. of formal dress)

formal as in characteristic of or befitting a person in authority

formal as in (of spoken and written language) adhering to traditional standards of correctness and without casual, contracted, and colloquial forms

formal as in represented in simplified or symbolic form

conventionalfollowing accepted customs and proprieties; conforming with accepted standards; (weapons) using energy for propulsion or destruction that is not nuclear energy; unimaginative and conformist; represented in simplified or symbolic form ; in accord with or being a tradition or practice accepted from the past; rigidly formal or bound by convention
schematicdiagram of an electrical or mechanical system ; represented in simplified or symbolic form

formal as in logically deductive

formal as in refined or imposing in manner or appearance

courtlyrefined or imposing in manner or appearance
statelyimpressive in appearance; of size and dignity suggestive of a statue ; refined or imposing in manner or appearance