a vs the

a

• All. 

• The name of the Latin script letter A / a. 

• The name of the Cyrillic script letter А / а. 

• across 

• All. 

• To do with time; Each, per, in, on, by. 

• To do with status; In. 

• To do with separation; In, into. 

• Of. 

• ah; er (sound of hesitation) 

• Distance from leading edge to aerodynamic center. 

• allele (recessive) 

• specific rotation 

• specific absorption coefficient 

• Have. 

• He, or sometimes she, it. 

• One; any indefinite example of; used to denote a singular item of a group. 

• Any, every; used before a noun which has become modified to limit its scope; 

• One certain or particular; any single. 

• Used before plural nouns modified by few, good many, couple, great many, etc. 

• Used in conjunction with the adjectives score, dozen, hundred, thousand, and million, as a function word. 

• The same; one. 

• Someone or something like; similar to; Used before a proper noun to create an example out of it. 

• The first letter of the English alphabet, written in the Latin script. 

the

• With a comparative or with more and a verb phrase, establishes a correlation with one or more other such comparatives. 

• With a comparative, and often with for it, indicates a result more like said comparative. This can be negated with none. 

• Introducing a singular term to be taken generically: preceding a name of something standing for a whole class. 

• Used before an adjective, indicating all things (especially persons) described by that adjective. 

• Used to indicate a certain example of (a noun) which is usually of most concern or most common or familiar. 

• Added to a superlative or an ordinal number to make it into a substantive. 

• Used before a body part (especially of someone previously mentioned), as an alternative to a possessive pronoun. 

• When stressed, indicates that it describes an object which is considered to be best or exclusively worthy of attention. 

• Definite grammatical article that implies necessarily that an entity it hints at is presupposed; something already mentioned, or completely specified later in that same sentence, or assumed already completely specified. 

• Used before an object considered to be unique, or of which there is only one at a time. 

• Used before a noun modified by a restrictive relative clause, indicating that the noun refers to a single referent defined by the relative clause. 

• Used before a superlative or an ordinal number modifying a noun, to indicate that the noun refers to a single item. 

• For each; per.