What is the meaning of Summe?

Obsolete form of sum.

highest, greatest, superlative

utmost (most extreme)

inflection of summen:

1. first-person singular present
2. singular imperative
3. first/third-person singular subjunctive I

first-person singular present

singular imperative

first/third-person singular subjunctive I

vocative masculine singular of summus

to buzz, hum, drone

to buzz, hum, drone

Source: wiktionary.org