Definition of emphatical in US English:

emphatical

adjective

  • 1Especially of language: powerfully and forcibly expressive; spoken with force or emphasis.

  • 2Of an action, attribute, argument, etc.: strongly marked; powerful, forceful.

  • 3Of a person: = "emphatic".

  • 4Of a word, syllable, etc.: that bears the stress in pronunciation. Also of a word: that has particular importance in a sentence.

  • 5History of Science. Designating colours that are not inherent in an object, such as those produced by a prism or seen in a rainbow, regarded as being less real than colours seen on the surface of something.

Usage

In modern use emphatic is the usual word; emphatical was more common until the 18th cent

Origin

Mid 16th century (in an earlier sense). From post-classical Latin emphaticus emphatic + -al.