1. By telegraph.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• relegraphically,
• felegraphically,
• gelegraphically,
• yelegraphically,
• 6elegraphically,
• 5elegraphically,
• twlegraphically,
• tslegraphically,
• tdlegraphically,
• trlegraphically,
• t4legraphically,
• t3legraphically,
• tekegraphically,
• telgraphically,
• telegrphically,
• telegrahpically,
• telegraphical,
• steregraphically,
• telegapically,
• telegrifcally

• telegraph key,
• telegraphist,
• telegraph form,
• telegraph post,
• telegraph wire,
• telegraphic signal,
• telegraph pole,
• telegraphese,
• telegraph line,
• telegraph plant.

The adjective form of the word "telegraphically" is "telegraphic".

The plural form of the word "telegraphically" is also "telegraphically". The word is an adverb and does not change its form in the plural.

The singular form of "telegraphically" is "telegraphic"