-vel

See also: vel, vel-, vēl, vél, vėl, veļ, and vęl

Hungarian

-vel

(case suffix) with, by (used to form the instrumental case); harmonic variant of -val.
repülő (“airplane”) → repülővel (“by airplane”)

Hungarian case suffixes

Case	Back vowel a, á, o, ó, u, ú	Front vowel
Case	Back vowel a, á, o, ó, u, ú	unrounded e, é, i, í	rounded ö, ő, ü, ű
nominative	—
accusative	-t
accusative	-ot / -at	-et	-öt
dative	-nak	-nek
instrumental	-val	-vel
causal-final	-ért
translative	-vá	-vé
terminative	-ig
essive-formal	-ként
essive-modal	-ul	-ül
inessive	-ban	-ben
superessive	-n
superessive	-on	-en	-ön
adessive	-nál	-nél
illative	-ba	-be
sublative	-ra	-re
allative	-hoz	-hez	-höz
elative	-ból	-ből
delative	-ról	-ről
ablative	-tól	-től
Note for all endings: Stem-final -a/-e changes to -á-/-é-, respectively, except -ként. alma — almában, but almaként zene ― zenében, but zeneként

(case suffix) Harmonic variants:
-val is added to back vowel words. Final -a changes to -á-.
anya (“mother”) → Anyával mentem vásárolni. - I went to shop with Mother.

-vel is added to front vowel words. Final -e changes to -é-.
zene (“music”) → Zenével szórakoztatta a vendégeket. - He entertained the guests with music.
When it is added to a word ending in a consonant, the v assimilates with the final consonant, and the final consonant becomes long:
busz (“bus”) → busz + val = busszal - by bus (buszval is a non-standard form, although it could still be heard in some dialects)

segítség (“help”) → segítség + vel = segítséggel - with help