ONE-OFF

One-off /ˌwʌn ˈɔːf/ (n):

# (British English) ​a thing that is made or that happens only once and not regularly.

- It was just a one-off; it won't happen again.

One-off /ˌwʌn ˈɔːf/ (adj):

# (British English) (North American English one-shot) [only before noun] ​made or happening only once and not regularly.

- a one-off payment.

At a/ one go | at/ in a single go (idiom):

# ​(British English) in one single attempt or try.

- She blew out the candles at one go.

Disposable /dɪˈspəʊzəbl/ (adj):

# [usually before noun] ​made to be thrown away after use.

- disposable gloves /razors.

- (British English) disposable nappies.

- (North American English) disposable diapers.

Once

Single

>>> at a (single) glance (idiom):

# ​immediately; with only a quick look.

- She is able to take in complex information at a single glance.

Rare

Rarely

Seldom

lump sum /ˌlʌmp ˈsʌm/ (n):

# (also lump sum payment) ​an amount of money that is paid at one time and not on separate occasions.

She was given a lump sum when she retired.

solely /ˈsəʊlli/ (adv):

# ​only; not involving somebody/ something else.

She was motivated solely by self-interest.

Selection is based solely on merit.

He became solely responsible for the firm.

sole /səʊl/ (adj):

# [only before noun] only; single.

the sole surviving member of the family

My sole reason for coming here was to see you.

This is the sole means of access to the building.

# belonging to one person or group; not shared.

She has sole responsibility for the project.

the sole owner

We may have the opportunity to take over sole ownership of the company.