| Subject | English | Irish |
| h.rghts.act. | four basic freedoms | na ceithre shaoirse bhunúsacha |
| market., commun. | four-color process | próiseas ceithre dhath |
| gen. | four common spaces | Ceithre Spás Chomónta an AE-na Rúise |
| gen. | four EU-Russia common spaces | Ceithre Spás Chomónta an AE-na Rúise |
| life.sc., fish.farm. | four-finger threadfin | snáitheiteach na gceithre mhéar (Eleutheronema tetradactylum) |
| h.rghts.act. | four freedoms | na ceithre shaoirse bhunúsacha |
| comp., MS | four-headed arrow | saighead ceithre cinn (Two arrows in shape of a cross, with two heads each pointing in opposite directions) |
| nat.res. | four-horned antelope | antalóp ceithre-adharcach (Tetracerus quadricornis) |
| agric. | four quarter flank | cliathán na ceathrún tosaigh |
| gen. | Four Spaces | Ceithre Spás Chomónta an AE-na Rúise |
| life.sc., fish.farm. | four-spot flounder | leith cheathairbhallach (Hippoglossina oblonga, Paralichthys oblongus) |
| life.sc., fish.farm. | four-spot megrim | scoilteán na gceithre shúil (Lepidorhombus boscii) |
| life.sc., fish.farm. | four-spotted megrim | scoilteán na gceithre shúil (Lepidorhombus boscii) |
| mech.eng. | four-stroke cycle engine | inneall ceithre bhuille |
| mech.eng. | four-stroke engine | inneall ceithre bhuille |
| environ. | four stroke engine An internal combustion engine whose cycle is completed in four piston strokes; includes a suction stroke, compression stroke, expansion stroke, and exhaust stroke | inneall ceithre bhuille |
| econ., fin. | Intergovernmental Group of Twenty-Four on International Monetary Affairs | Grúpa Idir-Rialtasach na gCeithre is Fiche um Ghnóthaí Airgeadaíochta Idirnáisiúnta |
| life.sc., fish.farm. | seventy-four seabream | garbhánach seachtó a ceathair (Polysteganus undulosus) |
| gen. | the four customs territories comprised in the Community | na ceithre chríoch chustaim a chuimsítear sa Chomhphobal |
