What is the meaning of -ra?

Conditional marker on verbs: if

used to make suggestions

Suffix forming adjectives from nouns.

Used to form the comparative degree of adjectives

Used to form the genitive plural of adjectives

Allative singular suffix.

[with verbal noun] in order to

Forms nouns or adjectives, mostly from nominal stems.

third-person singular future of -re

onto, on

for, by

Collective suffix, attached to nouns or adjectives, used to form nouns: -ry, -y

Rōmaji transcription of ら

nominal suffix

first/third-person singular imperfect subjunctive

Source: wiktionary.org