For the most part, almost completely, or as far as possible. It expresses that something applies to a very high degree, but small exceptions are possible.
example
Nach der Renovierung sind die Mängel am Gebäude weitestgehend behoben.
After the renovation, the defects in the building have largely been fixed.
Usage tips
Word structure
The word is made up of the superlative of 'weit' (far) as 'weitest-' and the participle 'gehend' (going). The literal meaning is 'going the farthest', which explains the figurative meaning 'to the greatest possible extent'.
EXAMPLE
Die beiden Parteien haben eine weitestgehende Einigung erzielt.
The two parties reached a far-reaching agreement.
Sentence position as an adverb
As an adverb, 'weitestgehend' (largely) usually appears in the middle of the sentence (in the Mittelfeld). It often modifies a verb, a participle, or an adjective that follows it.
EXAMPLE
Die Software ist mit allen gängigen Betriebssystemen weitestgehend kompatibel.
The software is largely compatible with all common operating systems.
Register and style
'Weitestgehend' (largely) belongs more to formal written language and is often used in reports, official communications, or business contexts. It sounds more elevated and precise.
EXAMPLE
Die Forderungen der Mitarbeiter wurden vom Unternehmen weitestgehend erfüllt.
The employees' demands were largely met by the company.
Compare with
near_synonym
weitestgehend vs fast
almost
'fast' and 'weitestgehend' both say that something is not quite complete. 'fast' is very general and fits many everyday situations when only a small part is missing. 'weitestgehend' sounds somewhat more formal and emphasizes that something is largely done, clarified, or achieved. It fits especially well with plans, rules, work, or reports. Put simply: 'fast' is neutral and short, while 'weitestgehend' sounds more precise and often more factual.
weitestgehend
Die Vorbereitungen für die Reise sind weitestgehend abgeschlossen.
The preparations for the trip are largely complete.
fast
Die Küche ist fast sauber, nur der Tisch muss noch abgewischt werden.
The kitchen is almost clean; only the table still needs to be wiped down.