And, is a conjunction. 1.  A conjunction is a word used to connect words or sentences in constructing, and to show the dependence of the terms so connected.

Most is an adverb. 1.  An adverb is a word added to a verb, a participle, an adjective, or an other adverb; and generally expresses time, place, degree, or manner.

Effectual is a common adjective, compared by means of the adverbs; effectual, more effectual, most effectual; or, effectual, less effectual, least effectual. 1.  An adjective is a word added to a noun or pronoun, and generally expresses quality. 2.  A common adjective is any ordinary epithet, or adjective denoting quality or situation. 3.  Those adjectives which may be varied in sense, but not in form, are compared by means of adverbs.

Method is a common noun, of the third person, singular number, neuter gender, and nominative case. 1.  A noun is the name of any person, place, or thing, that can be known or mentioned. 2.  A common noun is the name of a sort, kind, or class, of beings or things. 3.  The third person, is that which denotes the person or thing merely spoken of. 4.  The singular number is that which denotes but one. 5.  The neuter gender is that which denotes things that are neither male nor female. 6.  The nominative case is that form or state of a noun or pronoun, which usually denotes the subject of a finite verb.

Of is a preposition. 1.  A preposition is a word used to express some relation of different things or thoughts to each other, and is generally placed before a noun or a pronoun.

Teaching is a participle. 1.  A participle is a word derived from a verb, participating the properties of a verb, and of an adjective or a noun; and is generally formed by adding ing, d, or ed, to the verb.

Grammar is a common noun, of the third person, singular number, neuter gender, and objective case. 1.  A noun is the name of any person, place or thing, that can be known or mentioned. 2.  A common noun is the name of a sort, kind, or class, of beings or things. 3.  The third person is that which denotes the person or thing merely spoken of. 4.  The singular number is that which denotes but one. 5.  The neuter gender is that which denotes things that are neither male nor female. 6.  The objective case is that form or state of a noun or pronoun, which usually denotes the object of a verb, participle, or preposition.

Is is a verb. 1.  A verb is a word that signifies to be, to act, or to be acted upon.

Precisely is an adverb. 1.  An adverb is a word added to a verb, a participle, an adjective, or an other adverb; and generally expresses time, place, degree, or manner.