1 adjective influential in developmentmúnlaitheach adj1 c m uhe spent his formative years in Asiathug sé a luathbhlianta san Áise, tháinig sé in inmhe san Áisethey were my most formative yearsb'in iad na blianta ba mhó a raibh tionchar acu orm, b'in iad na blianta ba mhó a chuaigh i bhfeidhm orm2 adjective ED relating to sb's developmentfoirmitheach adj1 c m umúnlaitheach adj1 c m uformative assessmentmeasúnú múnlaitheach3 adjective LING of morphemefoirmitheach adj1 c m uformative suffixiarmhír fhoirmitheach4 noun LING formative elementfoirmitheach masc1 c m u